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Journal articles on the topic 'Corrugated tube'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Wu, Zhiwei, Caifu Qian, Gang Liu, Zhisheng Liu, and Ping Sheng. "Mechanical Properties and Heat Transfer Performance of Conically Corrugated Tube." Materials 14, no. 17 (August 28, 2021): 4902. http://dx.doi.org/10.3390/ma14174902.

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Conically corrugated tube is a new type of high-efficiency heat exchange tube. In this paper, the mechanical and heat transfer properties of conically corrugated tubes formed by the cold rolling of smooth tubes are studied through experimental measurement and numerical simulation to lay the foundations for applying the tubes in heat exchangers. The results show that while conically corrugated tube has a lower axial elastic stiffness compared with smooth tube, conically corrugated tube has a higher yield strength and ultimate strength. Unlike smooth tubes, conically corrugated tubes develop three-dimensional stresses when an axial tensile load is applied to them. In addition, the heat transfer coefficient of conically corrugated tube is 15%, 17%, and 115% higher than that of spiral grooved tube, convergent divergent tube, and smooth tube, respectively. Finally, the correlation equations of the axial stress concentration factor, stiffness equivalent coefficient, Nusselt number, and flow resistance coefficient of conically corrugated tubes are obtained for engineering application.

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2

Gacesa, Branka, Tasko Maneski, Vesna Milosevic-Mitic, Miodrag Nestorovic, and Ana Petrovic. "Influence of furnace tube shapeon thermal strain of fire-tube boilers." Thermal Science 18, suppl.1 (2014): 39–47. http://dx.doi.org/10.2298/tsci130317172g.

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The aim of this paper is to use numerical analysis and fine element method-FEM to investigate the influence of furnace tube shape on the thermal strain of fire-tube boilers. Thermal stresses in corrugated furnace tubes of different shape, i.e. with different corrugation pitch and depth, were analysed first. It was demonstrated that the thermal stresses in corrugated furnace tube are significantly reduced with the increase of corrugation depth. Than deformations and stresses in the structure of a fire-tube boiler were analysed in a real operating condition, for the cases of installed plain furnace tube and corrugated furnace tubes with different shapes. It was concluded that in this fire-tube boiler, which is of larger steam capacity, the corrugated furnace tube must be installed, as well as that the maximal stress in the construction is reduced by the installation of the furnace tube with greater corrugation depth. The analysis of stresses due to pressure and thermal loads pointed out that thermal stresses are not lower-order stresses in comparison to stresses due to pressure loads, so they must be taken into consideration for boiler strength analysis.

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3

Yang, Chen, Min-rui Chen, Jin-yuan Qian, Zan Wu, Zhi-jiang Jin, and Bengt Sunden. "Heat transfer study on a hybrid smooth and spirally corrugated tube." MATEC Web of Conferences 240 (2018): 01038. http://dx.doi.org/10.1051/matecconf/201824001038.

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Corrugated tubes are widely used in a range of applications for heat transfer enhancement. The spirally corrugated tube has a better heat transfer performance than the smooth tube. In this paper, the heat transfer performance of a hybrid smooth and six-start spirally corrugated tube is studied. With a validated numerical model, the effects of the corrugation part length on the vortex in the downstream smooth tube are studied for a range of high Reynolds numbers, where the existence of the corrugation part can turn out the secondary flow and enhance heat transfer. Meanwhile, it is found that in the smooth part, the fluid flow part with whirling can reach a maximum length, even if the length of the corrugation part continuously increases. Thus a series of critical corrugation lengths can be obtained. This work can reveal the enhanced heat transfer mechanism of the hybrid smooth and spirally corrugated tube and be of interest to researchers in heat transfer issues of corrugated tubes.

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4

Xi, Guan Nan, Wei An Xie, and Guo Ru Xie. "Research on and Analysis of Enhanced Heat Transfer Tubes." Applied Mechanics and Materials 448-453 (October 2013): 2908–11. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2908.

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The article makes analysis of the latest research situation and development tendency of several typical enhanced heat transfer tubes, such as spirally corrugated tube, transversely-ridged tube, corrugated tube and converging-diverging tube, as well as comparing their enhanced diathermancy respectively. Therefore, the author’s research will have positive effect on energy utilization efficiency.

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5

Kim, Nae-Hyun, and Ho-Seung Han. "Steam Condensation Enhancement by Applying Self-Assembled Monolayer (Chlorosilane) on Titanium Corrugated Tubes." International Journal of Air-Conditioning and Refrigeration 27, no. 01 (March 2019): 1950009. http://dx.doi.org/10.1142/s2010132519500093.

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It is well known that dropwise condensation enhances the condensation heat transfer coefficient significantly compared with film condensation. In the present study, dropwise condensation heat transfer characteristics on titanium corrugated tubes were investigated. Two corrugated tubes with different corrugation pitch and depth were tested at the steam pressures of 5 and 10[Formula: see text]kPa. To promote dropwise condensation, silane-based SAM was coated. For bare corrugated tubes, significant enhancement of condensation heat transfer was noted, especially for the 2.1/0.2 (corrugation pitch/corrugation depth in mm) tube. For SAM-coated tubes, the heat transfer enhancement was significant (2.61 at 5[Formula: see text]kPa and 2.45 at 10[Formula: see text]kPa) for the smooth tube. For the corrugated tubes, however, the enhancement decreased to 1.78 and 2.22 for 8.7/0.4 tube and to 1.26 and 1.52 for 2.1/0.2 tube. The present results suggest that corrugations may not be as an effective heat transfer method for dropwise condensation as it is for film condensation. This result was supported by the photos taken by mist spray, which suggested that surface tension drained condensation by corrugations is not a major heat transfer mechanism for dropwise condensation on corrugated tubes.

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6

Tong, Zheng Ming, Kai Zhu, Jia Lei Lu, and Gen Li. "Numerical Study of Laminar Flow and Heat Transfer Characteristic in Wave Tubes Based on Sine Curve." Advanced Materials Research 322 (August 2011): 349–52. http://dx.doi.org/10.4028/www.scientific.net/amr.322.349.

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A new type of corrugated tube based on sine function is proposed by introducing a parameter of sine camber in this paper. Computational Fluid Dynamics (CFD) was used to analysis flow state and sine camber of tube influence on the heat transfer and flow. The heat transfer and flow around sinusoidal corrugated tubes with different sine camber e are investigated. According to the numerical calculus result, correlation equations of Nu (Nusselt) =f(Re) is given. At last, the theoretical comparative analysis with field synergy principle is carried out for the heat transfer and flow resistance in smooth tube and sinusoidal corrugated tube.

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7

Lu, Lin Ping, and Liang Ying. "Comparative Experimental Study on Performance of Corrugated Tube and Straight Tube Heat Exchanger." Advanced Materials Research 560-561 (August 2012): 156–60. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.156.

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The experiments on heat transfer coefficient, pressure drop and thermal stress were done to heat exchangers with corrugated tubes and staight tubes. By analyising and comparing the heat transfer coeffient, pressure drop in tube side and shell side and axial force and stress, some conclusions can be conducted that the corrugated tube heat exchanger has better heat transfer coeffient, higher pressure drop and much lower stress caused by temperatur difference, also, it has obvious advantages under the circumstance of low Reynolds number and high temperature difference.

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8

Kaood, A., T. Abou-Deif, H. Eltahan, MA Yehia, and EE Khalil. "Numerical investigation of heat transfer and friction characteristics for turbulent flow in various corrugated tubes." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 4 (October 18, 2018): 457–75. http://dx.doi.org/10.1177/0957650918806407.

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Thermal and hydraulic characteristics of turbulent water flow in a transverse corrugated tube with various corrugation direction (inward/outward) and corrugation shape (triangle, curve, rectangle, and trapezoid) are numerically investigated. The axisymmetric model of corrugated tubes with 10 mm inner diameter was investigated by changing the geometrical parameters for Reynolds number ranging from 5000 to 61,000 and constant heat flux boundary condition. Structured, nonuniform grid system is applied. Momentum, continuity, and energy equations were treated by means of a finite volume method using the SIMPLE scheme with the k–ε turbulence model and enhanced wall treatment. The results reveal that corrugation direction and corrugation shape have perceptible effects upon the heat transfer in the form of Nusselt number ( Nu) and pressure drop in the form of friction factor (ƒ). The average Nu for (inward) trapezoidal, rectangular, curved, and triangular corrugation shapes are 52.61%, 50.12%, 47.82%, and 44.96%, respectively, higher than the smooth tube. The average Nu for (outward) trapezoidal, curved, triangular, and rectangular corrugation shapes are 48.31%, 45.72%, 41.23%, and 40.94%, respectively, which are higher than a smooth tube. The results reveal that both inward/outward curved and triangular roughness shape have the superior performance evaluation criterion than rectangular and trapezoidal. Turbulence kinetic energy contour shows the increase in heat transfer performance for all corrugated tubes compared with a smooth tube. Inward corrugated tube provides the highest turbulence kinetic energy along the tube length and, consequently, the highest heat transfer. In addition, inward corrugated tubes provide the highest values and homogeneity of the velocity distribution along the core of tubes.

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9

Shannak, B., R. Damseh, M. Al-Odat, M. Al-Shannag, and A. Azzi. "Two-Phase Flow through Corrugated U-Tube." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 11 (April 27, 2010): 2408–17. http://dx.doi.org/10.1243/09544062jmes1871.

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New measurements of the frictional pressure drop of air—water two-phase flow in a flexible corrugated U-tube have been carried out. Experiments were performed under the following conditions of two-phase parameters: mass flux of 300—800 kg/m2 s, gas quality of 1—60 per cent, and system pressure of 3—7 bar. The inner diameter of the U-tubes tested was 40 mm, with a ratio of curvature radius to inner diameter varying from 3 to 7.5. The results demonstrate that the two-phase flow resistance, energy dissipation, friction losses, and interaction of the two phases in flexible corrugated U-tubes are perceptible about two to five times greater than those in smooth U-tubes. Hence, the two-phase friction factor of such tubes increases from 0.65 to 1.4, depending on the influencing flow and geometrical parameters. The available correlations in the open literature present a similar trend and behaviour. However, they predict the data presented poorly because of the complex geometry of the flexible corrugated U-tube. Based on the energy balance and the presented experimental results, a new model has been developed to calculate the frictional two-phase pressure drop and hence the friction factor of the flexible U-tube. The model includes the relevant primary parameter, fits the experimental data well, and is sufficiently accurate for engineering purposes. The standard deviation of the data is less than 7 per cent. The reported results enable a practical design with standard products and optimization of the geometry of the flexible corrugated U-tube for specific conditions.

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10

Navickaitė, Kristina, Michael Penzel, Christian R. H. Bahl, and Kurt Engelbrecht. "Performance Assessment of Double Corrugated Tubes in a Tube-In-Shell Heat Exchanger." Energies 14, no. 5 (March 1, 2021): 1343. http://dx.doi.org/10.3390/en14051343.

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In this article, the performance of double corrugated tubes applied in a tube-in-shell heat exchanger is analysed and compared to the performance of a heat exchanger equipped with straight tubes. The CFD (computational fluid dynamics) analysis was performed considering a turbulent flow regime at several mass flow rates. It is observed that the double corrugated geometry does not have a significant impact on the pressure drop inside the analysed heat exchanger, while it has the potential to increase its thermal performance by up to 25%. The ε–NTU (effectiveness–number of transfer units) relation also demonstrates the advantage of using double corrugated tubes in tube-in-shell heat exchangers over straight tubes.

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11

Tong, Zheng Ming, Kai Zhu, Yong Hai Hu, Li Ye, Jia Lei Lu, and Chao Li. "Convective Heat Transfer Characteristics of Laminar Flow in Sinusoidal Corrugated Tube." Advanced Materials Research 236-238 (May 2011): 1277–82. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1277.

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A new type of corrugated tube based on sine function is proposed by introducing a parameter of sine camber. The heat transfer and flow around sinusoidal corrugated tubes with different sine camber e are investigated in this paper. Computational Fluid Dynamics (CFD) was used to analysis flow state and sine camber of tube influence on the heat transfer and flow, a correlation equations of Nu (Nusselt) =f(Re) is given. At last, the theoretical comparative analysis with field synergy principle is carried out for the heat transfer and flow resistance in smooth tube and sinusoidal corrugated tube. The results show that the experiment basically tallies with the value of numerical calculation of laminar flow. In the range of 500 < Re < 1000, flow resistance coefficient has great decrease extent, while low resistance coefficient has small decrease extent of 1500 < Re < 2300. The effect of field synergy is poor in the smooth tube, which is opposite to that in sinusoidal corrugated tube, and it can improve the efficiency of around 2.7 times.

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12

Eiamsa-ard, S., and P. Promthaisong. "Counter-rotation vortex flows and heat transfer mechanisms in a V-spirally-corrugated tube." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 7 (February 13, 2019): 928–52. http://dx.doi.org/10.1177/0957650919829367.

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The flow and heat transfer behavior of newly designed V-corrugated tubes with various numbers of starts ( N = 2, 3, 4, and 5), depth ratios ( DR = 0.02–0.14), and pitch ratios ( PR = 1.0–2.0) were studied in the turbulent flow region (5000 ≤ Re ≤ 20,000). The friction factor ( f), friction factor ratio ( f/ f0), Nusselt number ( Nu), Nusselt number ratio ( Nu/ Nu0), and thermal enhancement factor ( TEF) values are reported. The computational results indicate that the conventional spirally-corrugated tube create swirl flows while V-corrugated tubes generate a counter-rotating vortex flow that impinges upon the lower zone of the tubes and enhances fluid transfer between tube core and near-wall regions. The results also show that the f, Nu, f/ f0, Nu/ Nu0 monotonically increase with decreasing PR, increasing DR and N, while the TEF is dependent on a tradeoff between f/ f0 and Nu/ Nu0. Over the studied range, the f/ f0, Nu/ Nu0, and TEF were in the ranges of 1.36–43.82, 1.00–5.35, and 0.80–2.11, respectively. The maximum TEF, 2.11, was achieved with a V-corrugated tube with an N of 4, DR of 0.06, and PR of 2.0 at Re = 5000.

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13

Zhao, Xiu Ting. "Evaporation-Air-Cooled Heat Exchanger Heat Pipe Research." Advanced Materials Research 694-697 (May 2013): 707–11. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.707.

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The evaporation-air-cooled (methanol) heat exchanger the actual condition, in the same conditions, five different heat exchanger tube simulated temperatures and stress field. The results show the elliptical tube and corrugated tube heat exchangers are best, built-spring pipe is better. Elliptical tube's stress is the maximum, corrugated pipe has stress concentration. Application enhanced heat transfer technology, a relatively compact structure can be used to transfer the required heat, using enhanced tubes instead of smooth tube is an effective method.Considering the safety, cost, and heat transfer efficiency and other factors, the final evaporation-air-cooled (methanol) built-spring heat exchange tube is more reasonable choice.

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14

Han, Jian Huang, Yang Liu, Zun Ce Wang, and Sen Li. "Numerical Simulation and Structure Optimization on the Corrugated Tubes of a Double Pipe Heat Exchanger." Applied Mechanics and Materials 385-386 (August 2013): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.65.

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The combination of numerical simulation and orthogonal experimental design method can reduce the test number. Structural parametric modeling research on corrugated tube of heat exchangers in our work to establish the fluid flow and heat transfer numerical simulation model. A scheme of orthogonal test of a corrugated tube, which includes 4 factors and 3 levels and has taken heat exchange quantity, resistance of the internal tube and annular gap as evaluation indexes, was designed. A method combining with the difference and the variance analysis was taken to analysis the result of orthogonal test, and the effect of different structure parameter on corrugated tube was achieved. Finally the optimal structure parameter of the corrugated tube was obtained by a comprehensive balance method, and those methods above-mentioned provide a reference for the design or promotion of the corrugated tube of tube heat exchanger.

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15

Cao, Yan, Hamdi Ayed, Ali E. Anqi, Omid Tutunchian, Hamed Sadighi Dizaji, and Samira Pourhedayat. "Helical tube-in-tube heat exchanger with corrugated inner tube and corrugated outer tube; experimental and numerical study." International Journal of Thermal Sciences 170 (December 2021): 107139. http://dx.doi.org/10.1016/j.ijthermalsci.2021.107139.

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16

Uhlig, R., B. Gobereit, and J. Rheinländer. "Advancing Tube Receiver Performance by Using Corrugated Tubes." Energy Procedia 69 (May 2015): 563–72. http://dx.doi.org/10.1016/j.egypro.2015.03.065.

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17

Han, Huaizhi, Longbin Yang, Yiran Hu, Ruitian Yu, and Qun Zhang. "Numerical study on the influencing mechanism of twisted ratio in outward convex corrugated tubes with a twisted tape insert." Thermal Science 22, Suppl. 2 (2018): 577–84. http://dx.doi.org/10.2298/tsci170614042h.

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Numerical investigations were conducted on flow and heat transfer in an outward convex corrugated tube with various structural twisted tape inserts. The study investigated the influence of twisted ratio on thermodynamic regulation and mechanism in the corrugated tube. The results indicate that Nusselt number in the corrugated tube (Nuc) exceeds those in the corrugated tube and smooth tube by 120-136% and 171-317%, respectively. Meanwhile, the friction factor increases by 148-153% and 476-514%, respectively. The best overall thermal performance (h = 1.97) is obtained with a high twist ratio (y/w = 5). However, the highest thermal performance (Nuc/Nus = 4.78) is obtained with the lowest twist ratio (y/w = 1.25).

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18

Huang, Dacheng, and Jianrun Zhang. "Numerical Simulation and Experimental Study on Axial Stiffness and Stress Deformation of the Braided Corrugated Hose." Applied Sciences 11, no. 10 (May 20, 2021): 4709. http://dx.doi.org/10.3390/app11104709.

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To explore the mechanical properties of the braided corrugated hose, the space curve parametric equation of the braided tube is deduced, specific to the structural features of the braided tube. On this basis, the equivalent braided tube model is proposed based on the same axial stiffness in order to improve the calculational efficiency. The geometric model and the Finite Element Model of the DN25 braided corrugated hose is established. The numerical simulation results are analyzed, and the distribution of the equivalent stress and frictional stress is discussed. The maximum equivalent stress of the braided corrugated hose occurs at the braided tube, with the value of 903MPa. The maximum equivalent stress of the bellows occurs at the area in contact with the braided tube, with the value of 314MPa. The maximum frictional stress between the bellows and the braided tube is 88.46MPa. The tensile experiment of the DN25 braided corrugated hose is performed. The simulation results are in good agreement with test data, with a maximum error of 9.4%, verifying the rationality of the model. The study is helpful to the research of the axial stiffness of the braided corrugated hose and provides the base for wear and life studies on the braided corrugated hose.

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19

Rafiei, Alireza, Reyhaneh Loni, Gholamhassan Najafi, and Talal Yusaf. "Study of PTC System with Rectangular Cavity Receiver with Different Receiver Tube Shapes Using Oil, Water and Air." Energies 13, no. 8 (April 24, 2020): 2114. http://dx.doi.org/10.3390/en13082114.

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Today, application of cavity receivers in solar concentrator systems is suggested as an interesting and novelty research subject for increasing thermal performance. In this research, a parabolic trough concentrator (PTC) with a rectangular cavity receiver was energetically investigated. The cavity receiver was studied with smooth and corrugated tubes. Different solar heat transfer fluids were considered, including water, air, and thermal oil. The effect of different operational parameters, as well as structural parameters, was investigated. The results showed that the linear rectangular cavity receiver with corrugated tube showed higher amounts of the absorbed heat and energy performance compared to the smooth tube as the cavity tube. Thermal performance of the rectangular cavity was improved using the application of water as the solar heat transfer fluid, which was followed by thermal oil and, finally, air, as the solar heat transfer fluid. Finally, it could be recommended that the rectangular cavity receiver with smooth tube using air as the solar heat transfer fluid is more appropriate for coupling this system with a Bryton cycle, whereas the rectangular cavity receiver with the corrugated tube using water or oil as the solar heat transfer fluid is recommended for achieving higher outlet temperature of the heat transfer fluid.

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20

Djordjevic, Milan, Velimir Stefanovic, Dragan Kalaba, Marko Mancic, and Marko Katinic. "Radiant absorption characteristics of corrugated curved tubes." Thermal Science 21, no. 6 Part B (2017): 2897–906. http://dx.doi.org/10.2298/tsci160420263d.

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The utilization of modern paraboloidal concentrators for conversion of solar radiation into heat energy requires the development and implementation of compact and efficient heat absorbers. Accurate estimation of geometry influence on absorption characteristics of receiver tubes is an important step in this process. This paper deals with absorption characteristics of heat absorber made of spirally coiled tubes with transverse circular corrugations. Detailed 3-D surface-to-surface Hemicube method was applied to compare radiation performances of corrugated and smooth curved tubes. The numerical results were obtained by varying the tube curvature ratio and incident radiant heat flux intensity. The details of absorption efficiency of corrugated tubes and the effect of curvature on absorption properties for both corrugated and smooth tubes were presented. The results may have significance to further analysis of highly efficient heat absorbers exposed to concentrated radiant heating.

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21

Li, Hui Fang, Cai Fu Qian, and Xiao Dong Yu. "Effects of Tube Stiffness and Tubesheet Thickness on the Thermal Stress of the Tubes and Tubesheet." Advanced Materials Research 314-316 (August 2011): 1552–55. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1552.

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In this paper, numerical simulation was carried out for the tube bundle of a float-head heat exchanger with concentration on the effects of tube stiffness and tubesheet thickness on the thermal stress of the tubes and tubesheet. It is found that decreasing the tube stiffness by using corrugated tubes can reduce the axial thermal stress at the tubes and, thus, decrease the possibility of strength failure of the connection between the tubes and tubesheet. Decreasing the tubesheet thickness can reduce the thermal stress at the tubesheet, which is meaningful for the heat exchangers with large temperature difference between the shell-side fluid and tube-side fluid and under small pressures.

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22

Sadighi Dizaji, Hamed, Samad Jafarmadar, and Soheil Asaadi. "Experimental exergy analysis for shell and tube heat exchanger made of corrugated shell and corrugated tube." Experimental Thermal and Fluid Science 81 (February 2017): 475–81. http://dx.doi.org/10.1016/j.expthermflusci.2016.09.007.

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23

LAOHALERTDECHA, S., A. S. DALKILIC, and S. WONGWISES. "A REVIEW ON THE HEAT-TRANSFER PERFORMANCE AND PRESSURE-DROP CHARACTERISTICS OF VARIOUS ENHANCED TUBES." International Journal of Air-Conditioning and Refrigeration 20, no. 04 (December 2012): 1230003. http://dx.doi.org/10.1142/s2010132512300030.

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The enhanced tube is a kind of the passive technique for improving the thermal performance of the heat exchangers with a little increase of the friction penalty. They have stated to use instead of the common smooth tubes for designing of the heat exchangers. The size of these heat exchangers can be reduced considerably by using the enhanced tubes instead of smooth tubes. Normally, they are divided into four groups: the corrugated tube, ribbed tube, grooved tube, and fluted tube. Compared with the common smooth tube, many researchers reported that use of the enhanced tubes dramatically increases the heat-transfer performance, both theoretically and experimentally. Focusing on the advantages of the enhanced tubes, this article summarizes the published studies on the heat-transfer and pressure-drop characteristics of the enhanced tubes, both experimental and quantitative investigations.

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24

SERAFIN, STEFANIA, and JURAJ KOJS. "Computer models and compositional applications of plastic corrugated tubes." Organised Sound 10, no. 1 (April 2005): 67–73. http://dx.doi.org/10.1017/s1355771805000683.

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A flexible plastic corrugated tube known as the Hummer was a popular sonic toy in the early 1970s. It produces pleasing sonorities when whirled in the air. In this article, we propose a physically informed model of a singing corrugated tube. The model was used in the composition Garden of the Dragon, which is also described in this paper.

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25

Jiang, Hongyong, Yiru Ren, Zhihui Liu, Songjun Zhang, and Xiaoqing Wang. "Evaluations of failure initiation criteria for predicting damages of composite structures under crushing loading." Journal of Reinforced Plastics and Composites 37, no. 21 (June 22, 2018): 1279–303. http://dx.doi.org/10.1177/0731684418783847.

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The crushing behaviors of thin-walled composite structures subjected to quasi-static axial loading are comparatively evaluated using four different failure initiation criteria. Both available crushing tests of composite corrugated plate and square tube are used to validate the stiffness degradation-based damage model with the Maximum-stress criterion. Comparatively, Hashin, Maximum-stress, Stress-based Linde, and Modified criteria are respectively implemented in the damage model to predict crush behaviors of corrugated plate and square tube. To develop failure criteria, effects of shear coefficients and exponents in the Modified and Maximum-stress criteria on damage mechanisms of corrugated plate are discussed. Results show that numerical predictions successfully capture both of experimental failure modes and load–displacement responses. The Modified criterion and particularly Maximum-stress criterion are found to be more appropriate for present crush models of corrugated plate and square tube. When increasing the failure index, the crushing load is decreased, which also causes premature material failure. The shear coefficient and exponents have dramatic influence on the crushing load. Overall, an insight into the quantitative relation of failure initiation is obtained.

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26

Jişa, Vasile Sergiu, Beniamin Vasile Chetran, and Dan Mândru. "Positioning Systems Actuated by Corrugated Tube Elements." Applied Mechanics and Materials 658 (October 2014): 644–47. http://dx.doi.org/10.4028/www.scientific.net/amm.658.644.

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The purpose of this paper is to validate the actuation of the positioning systems with a new type of pneumatic actuators based on corrugated tubular elements. The latter are also called bellows, usually operating as sealing elements or as pressure transducers.The CAD models of two positioning systems actuated with corrugated tube elements are given. The first one, with one degree of freedom, is driven by two bellows disposed in antagonist way, powered with different pressures, offering different displacements and adjustable stiffness. The second positioning system contains two overlapping platforms that can slide on two axis, (having two degrees of fredom), their operation being performed individualy with two pairs of bellows arranged in antagonist way, on two levels, disposed at 900 from each other. Pneumatic diagrams for the two positioning systems are given. Experimental prototypes are developed and the results of the first tests are presented.

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27

Lazim, Tholudin Mat, Zaid Sattar Kareem, M. N. Mohd Jaafar, Shahrir Abdullah, and Ammar F. Abdulwahid. "Heat Transfer Enhancement in Spirally Corrugated Tube." International Review on Modelling and Simulations (IREMOS) 7, no. 6 (December 31, 2014): 970. http://dx.doi.org/10.15866/iremos.v7i6.4948.

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28

Barba, A., S. Rainieri, and M. Spiga. "HEAT TRANSFER ENHANCEMENT IN A CORRUGATED TUBE." International Communications in Heat and Mass Transfer 29, no. 3 (April 2002): 313–22. http://dx.doi.org/10.1016/s0735-1933(02)00321-4.

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29

Reyaz-Ur-Rahim, Mohd, P. K. Bharti, and Afaque Umer. "Axial Crushing Behaviors of Thin-Walled Corrugated and Circular Tubes - A Comparative Study." Technological Engineering 14, no. 1 (October 26, 2017): 5–10. http://dx.doi.org/10.1515/teen-2017-0001.

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Abstract With the help of finite element analysis, this research paper deals with the energy absorption and collapse behavior with different corrugated section geometries of hollow tubes made of aluminum alloy 6060-T4. Literature available experimental data were used to validate the numerical models of the structures investigated. Based on the results available for symmetric crushing of circular tubes, models were developed to investigate corrugated thin-walled structures behavior. To study the collapse mechanism and energy absorbing ability in axial compression, the simulation was carried in ABAQUS /EXPLICIT code. In the simulation part, specimens were prepared and axially crushed to one-fourth length of the tube and the energy diagram of crushing force versus axial displacement is shown. The effect of various parameters such as pitch, mean diameter, corrugation, amplitude, the thickness is demonstrated with the help of diagrams. The overall result shows that the corrugated section geometry could be a good alternative to the conventional tubes.

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Zheng, Yao, and Hehui Wang. "Thermal Stress Analysis of Tube Plate and Tube Bundle of Multi-Tube Pass Spirally Corrugated Tubes Heat Exchanger." IOP Conference Series: Earth and Environmental Science 687, no. 1 (March 1, 2021): 012130. http://dx.doi.org/10.1088/1755-1315/687/1/012130.

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Sethumadhavan, R., and M. Raja Rao. "Turbulent Flow Friction and Heat Transfer Characteristics of Single- and Multistart Spirally Enhanced Tubes." Journal of Heat Transfer 108, no. 1 (February 1, 1986): 55–61. http://dx.doi.org/10.1115/1.3246905.

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Investigations have been carried out on heat transfer and frictional characteristics of five spirally corrugated tubes of one to four corrugation starts, having the same helix angle, but of varying geometrical aspect ratios, for the turbulent flow of water and 50 percent glycerol. The thermal performance of these tubes was found to be superior compared to a smooth tube. Friction factors and heat transfer coefficients in these rough tubes were analysed on the basis of momentum and heat transfer analogy, and the correlation obtained was tested with the present data and also the published results of previous investigators. Performance evaluation criteria were used for the quantitative demonstration of the benefits offered by these spirally corrugated tubes for heat exchanger applications.

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32

Wu, Shuang Ying, Lan Xiao, Si Min Chen, and Feng Hua Guo. "Exergo-Economic Performance Evaluation of Enhanced Tube under Equivalent Pump Power Consumption." Advanced Materials Research 354-355 (October 2011): 310–14. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.310.

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Based on the first and second laws of thermodynamics as well as exergo-economic theory, comprehensive performance evaluation criterion has been proposed for enhanced tube under the condition of equivalent pump (fan) power consumption, accounting for a variety of factors such as heat transfer, flow and investment costs. Performance evaluation criterion formula, namely, net profit value (NPV) has been derived from the perspective of the exergy recovery. Take spirally corrugated tube as an example, the results show that the exergo-economic performance of the spirally corrugated tube is superior to smooth tube for the range considered in the present study. From the viewpoint of NPV, although NPV of enhanced tube is greater than that of smooth tube, there exist critical values of Re and Nq exceeding which NPV of enhanced tube would be less than zero, showing no engineering significance.

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Kim, Jin Bong. "Effects on Mechanical Behavior of the Flexible Tube for Automobile." Applied Mechanics and Materials 152-154 (January 2012): 749–52. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.749.

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Flexible tubes are commonly used in automobile and piping systems to absorb expansion and contraction in order to reduce stress. Unlike to other piping components, flexible tubes consist of a thin walled shell of revolution with a corrugated meridian, in order to provide the flexibility needed to absorb mechanical movements. It is very complicated to analyze the behavior of flexible tubes because of its complex figure. Some fundamental behavior of the flexible tube for automobile is reported with analysis method. Obtained results are as follows; (1) The von-Mises stress is increased with increase of deflection at the flexible tube end and the linearity of stress variation depends on length of the flexible tube. (2) The number of cycles to failure is decreased with increase of deflection at the flexible tube end.

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Kim, Nae-Hyun. "Steam Condensation and Tube-Side Heat Transfer of Titanium Corrugated Tubes." Heat Transfer Engineering 41, no. 4 (January 19, 2019): 324–32. http://dx.doi.org/10.1080/01457632.2018.1540455.

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35

Rahim, Mohd Reyaz Ur, and Prem Kumar Bharti. "Energy absorption characteristics of thin-walled sinusoidal corrugated tube using RSM-CCD." Production Engineering Archives 26, no. 4 (December 1, 2020): 144–53. http://dx.doi.org/10.30657/pea.2020.26.27.

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AbstractThe axial crushing behaviour of tubes of different section shapes has been extensively investigated as they have an excellent energy absorption, but the thin walled corrugated tube structures have been designed to further improve their energy absorption performance. The study aims to analyze the effect of sinusoidal corrugations along cross section of the tube on peak force, energy absorption and specific energy absorption. In the present work the response surface methodology (RSM) using central composite design (CCD) has been used and simulation work is performed by using ANSYS workbench to explore the effects of geometrical parameters on the responses of constructing models.

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36

Rahim, Mohd Reyaz Ur, and Prem Kumar Bharti. "Energy absorption characteristics of thin-walled sinusoidal corrugated tube using RSM-CCD." Production Engineering Archives 26, no. 4 (December 1, 2020): 144–53. http://dx.doi.org/10.30657/pea.2020.26.27.

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Abstract The axial crushing behaviour of tubes of different section shapes has been extensively investigated as they have an excellent energy absorption, but the thin walled corrugated tube structures have been designed to further improve their energy absorption performance. The study aims to analyze the effect of sinusoidal corrugations along cross section of the tube on peak force, energy absorption and specific energy absorption. In the present work the response surface methodology (RSM) using central composite design (CCD) has been used and simulation work is performed by using ANSYS workbench to explore the effects of geometrical parameters on the responses of constructing models.

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37

HEWITT, G. F., and J. S. MARSHALL. "Particle focusing in a suspension flow through a corrugated tube." Journal of Fluid Mechanics 660 (July 21, 2010): 258–81. http://dx.doi.org/10.1017/s0022112010002697.

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A computational study is performed of the transport of a particulate suspension through a corrugated tube using a discrete-element method (DEM). The tube is axisymmetric with a radius that varies sinusoidally along the tube length, which, in the presence of a mean suspension flow, leads to periodic inward and outward acceleration of the advected particles. The oscillations in radial acceleration and straining rate lead to a net radial drift, with mean acceleration measuring about an order of magnitude smaller than the instantaneous radial acceleration, which over time focuses small particles within the tube. The foundations of particle focusing in this flow are examined analytically using lubrication theory, together with a low-Stokes-number approximation for the particle drift. This lubrication-theory solution provides the basic scaling for how the particle drift will vary with wave amplitude and wavelength. Computations are then performed using a finite-volume method for a fluid flow in the tube at higher Reynolds numbers over a range of amplitudes, wavelengths and Reynolds numbers, examining the effect of each of these variables on the averaged radial fluid acceleration. A DEM is used to simulate particle behaviour at finite Stokes numbers, and the results are compared to an asymptotic approximation valid for low Stokes numbers. At low tube Reynolds number (e.g. Re = 10), the drift velocity induced by the tube corrugations focuses the particles onto the tube centreline, in accordance with the low-Stokes-number approximation based on the axial-averaged fluid radial acceleration. At higher tube Reynolds numbers (e.g. Re = 100), the correlation between the particle radial oscillation and the fluid acceleration field leads the outermost particles to drift into a ring at a finite radius from the tube centre, with little net motion of the particles in the innermost part of the tube. At larger Stokes numbers, particles can be dispersed to the outer regions of the tube due to particle outward dispersion from the large instantaneous radial acceleration. The effects of eddy formation within the corrugation crests on particle focusing are also examined.

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Garg, Rakesh. "Kinked inner tube of coaxial Bain circuit—need for corrugated inner tube." Journal of Anesthesia 23, no. 2 (May 2009): 306. http://dx.doi.org/10.1007/s00540-008-0719-y.

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Ahn, Soo Whan, and Myoung Ho Kim. "EFFECTS OF INNER CORRUGATED TUBES ON HEAT TRANSFER IN THE ANNULAR TUBE." Transactions of the Canadian Society for Mechanical Engineering 28, no. 3-4 (September 2004): 567–79. http://dx.doi.org/10.1139/tcsme-2004-0038.

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40

Norman, A. D., K. A. Seffen, and S. D. Guest. "Multistable corrugated shells." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 464, no. 2095 (March 10, 2008): 1653–72. http://dx.doi.org/10.1098/rspa.2007.0216.

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We have been constructing and investigating multistable corrugated shell structures. The multistability arises from the interaction between internal prestresses created during forming and nonlinear geometrical changes during deformation. Using a simplified analytical elastic model, we homogenize the properties of the shells through simultaneously considering the material on two scales: the ‘local’ scale of the isotropic material; and the ‘global’ scale of the corrugated sheet, which is then modelled as an equivalent flat sheet with anisotropic properties. This model is applied to simulate two modes of bistability observed in prototypes: first, prestressed corrugated shells that, when buckled, can coil up into a tube repeatably and reversibly; and second, corrugated sheets with a symmetry-breaking ‘twisting’ curvature. The model gives an intuitive understanding of the behaviour, and has enabled us to understand forming processes that give the behaviour we wish, including tristable shells that combine both bistable modes.

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41

Shi, Jin Sheng, and Qiao Zhen Zhang. "A Perturbation Analysis of the Fully Developed Convective Heat Transfer inside a Longitudinal Corrugation Channel." Advanced Materials Research 588-589 (November 2012): 1858–61. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.1858.

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A theoretical research of the flow and heat transfer inside two longitudinally corrugated tube is carried out. An approximate model is presented by applying perturbation expanding to the governing flow and energy equations. Obtaining the solutions, effects of the amplitude and number of the wave surface of the corrugated wall on the flow and heat transfer are discussed.

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42

Nozu, Sh, K. Ozaki, H. Inaba, and H. Honda. "Condensation of a Nonazeotropic Refrigerant Mixture R114/R113 in Horizontal Annuli With an Enhanced Inner Tube." Journal of Heat Transfer 114, no. 1 (February 1, 1992): 201–10. http://dx.doi.org/10.1115/1.2911247.

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Local heat transfer and pressure drop measurements are made during condensation of a nonazeotropic refrigerant mixture R114/R113 in the annuli of horizontal double-tube condensers. The inner tube is a 19.1-mm-o.d. corrugated tube with copper wire fins soldered on the outer surface. The outer tubes are smooth tubes with different i.d. of 29.9 and 25.0 mm. The heat transfer coefficient based on the bulk-vapor to wall temperature difference is considerably smaller for R114/R113 mixtures than for pure R113. An empirical equation for the vapor phase mass transfer coefficient is derived, in which the dimensionless parameters are introduced on the basis of the previous results for turbulent single phase flow in smooth and rough tubes with and without surface suction. The measured condensation heat transfer coefficients for R114/R113 mixtures are correlated by the present model to a mean absolute deviation of 14.3 percent.

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Huang, Dacheng, and Jianrun Zhang. "Research on the Tensile Mechanical Properties of a Braided Corrugated Hose and Its Axial Stiffness Model." Journal of Marine Science and Engineering 9, no. 9 (September 18, 2021): 1029. http://dx.doi.org/10.3390/jmse9091029.

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Braided corrugated hoses are widely used in displacement compensation and vibration absorption environments due to their excellent flexibility and energy dissipation properties; however, the axial stiffness has rarely been discussed before as an important physical property of braided corrugated hoses. In this paper, the theoretical axial stiffness model for braided corrugated hoses is established based on the energy method and the theory of the curved beam. The influences of the braiding parameters of the metallic braided tube and the structural parameters of the bellows on the axial stiffness are also discussed. Through finite element tensile testing, the axial stiffness curves of the braided corrugated hose under different braiding angles and different wire diameters are obtained. The theoretical axial stiffness model is in good agreement with the simulation experiment, which reflects the nonlinear effects of the braiding angle and wire diameter on the braided corrugated hose. This paper provides an accurate method and basis for the design of braided corrugated hoses in the future.

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44

Djordjevic, Milan, Velimir Stefanovic, and Marko Mancic. "Pressure drop and stability of flow in Archimedean spiral tube with transverse corrugations." Thermal Science 20, no. 2 (2016): 579–91. http://dx.doi.org/10.2298/tsci150118212d.

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Isothermal pressure drop experiments were carried out for the steady Newtonian fluid flow in Archimedean spiral tube with transverse corrugations. Pressure drop correlations and stability criteria for distinguishing the flow regimes have been obtained in a continuous Reynolds number range from 150 to 15 000. The characterizing geometrical groups which take into account all the geometrical parameters of Archimedean spiral and corrugated pipe has been acquired. Before performing experiments over the Archimedean spiral, the corrugated straight pipe having high relative roughness e/d = 0.129 of approximately sinusoidal type was tested in order to obtain correlations for the Darcy friction factor. Insight into the magnitude of pressure loss in the proposed geometry of spiral solar receiver for different flow rates is important because of its effect upon the efficiency of the receiver. Although flow in spiral and corrugated geometries has the advantages of compactness and high heat transfer rates, the disadvantage of greater pressure drops makes hydrodynamic studies relevant.

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Zimparov, Ventsislav, and Plamen Penchev. "Performance Evaluation of Deep Spirally Corrugated Tubes for Shell-and-Tube Heat Exchangers." Journal of Enhanced Heat Transfer 11, no. 4 (2004): 423–34. http://dx.doi.org/10.1615/jenhheattransf.v11.i4.200.

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46

Sadighi, Amirreza, Mahshid Mahbod, and Masoud Asgari. "Bi-tubular corrugated composite conical–cylindrical tube for energy absorption in axial and oblique loading: Analysis and optimization." Journal of Composite Materials 54, no. 18 (January 2, 2020): 2399–432. http://dx.doi.org/10.1177/0021998319897407.

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In this paper, a new bi-tubular corrugated composite tube, consisting of inner and outer cylindrical and conical tubes is proposed. Different models with various geometrical parameters including the radius of curvatures and their numbers are considered and studied numerically in axial and oblique crushing in order to achieve favorable crashworthiness parameters. Moreover, quasi-static compression tests have been conducted to obtain results in order to validate the finite element model. There has been a sensible agreement between the numerical results and experimental data. Finite element models are also validated using the analytical solutions for both straight and corrugated composite tubes. Regardless of the number and radius of curvatures, as the crashworthiness of bi-tubular corrugated structures both in axial and oblique crushing is investigated and compared with their single-wall and bi-tubular straight peers, a considerable improvement is achieved in all crashworthiness parameters, including desirable increase in specific energy absorption, favorable reduction in peak force, and consequently a beneficial rise in crushing force efficiency. In addition, an optimization study using a suitable multi-objective function is done to choose the best model among the existing models, in addition to finding an optimum model via genetic algorithm. In the next step, a parametric study is conducted on the best model to inspect how well it undergoes oblique crushing at different angles. Finally, this best model and two other candidates have been chosen to investigate the effect of using foams and then the energy absorption capability of the empty and foam-filled tubes has been compared.

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47

Chalaev, Djamalutdin, Nina Silnyagina, Oleksii Shmatok, and Oleksandr Nedbailo. "Heat transfer enhancement in a corrugated tube heat exchanger." Ukrainian Food Journal 5, no. 2 (June 2016): 376–86. http://dx.doi.org/10.24263/2304-974x-2016-5-2-15.

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48

Paoloni, Claudio, Mauro Mineo, Manju Henry, and Peter G. Huggard. "Double Corrugated Waveguide for Ka-Band Traveling Wave Tube." IEEE Transactions on Electron Devices 62, no. 11 (November 2015): 3851–56. http://dx.doi.org/10.1109/ted.2015.2480535.

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49

Liu, J. W., and T. Y. Kam. "Fabrication and Strength Assessment of Composite Corrugated Expansion Tube." Journal of Physics: Conference Series 1509 (April 2020): 012016. http://dx.doi.org/10.1088/1742-6596/1509/1/012016.

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50

Phan-Thien, N., C. J. Goh, and M. B. Bush. "Viscous flow through corrugated tube by boundary element method." ZAMP Zeitschrift f�r angewandte Mathematik und Physik 36, no. 3 (May 1985): 475–80. http://dx.doi.org/10.1007/bf00944637.

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