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Journal articles on the topic 'Tube insert'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Reid, R. S., M. B. Pate, and A. E. Bergles. "A Comparison of Augmentation Techniques During In-Tube Evaporation of R-113." Journal of Heat Transfer 113, no. 2 (1991): 451–58. http://dx.doi.org/10.1115/1.2910582.

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An experimental study was conducted to determine the potential of three techniques for augmenting in-tube evaporation of refrigerants: high-fin tubes, microfin tubes, and twisted tape inserts. Five tubes with internal fins and one smooth tube with a twisted-tape insert were tested. Additionally, experiments were performed with two reference smooth tubes having diameters similar to the maximum inside diameters of the finned tubes. All experiments involved evaporating Refrigerant 113 (R-113) by direct electrical heating of the tube wall. Local evaporation heat transfer coefficients were measured

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2

Zimparov, Ventsislav, Plamen Penchev, and Joshua Meyer. "Performance evaluation of tube-in-tube heat exchangers with heat transfer enhancement in the annulus." Thermal Science 10, no. 1 (2006): 45–56. http://dx.doi.org/10.2298/tsci0601045z.

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Different techniques as angled spiraling tape inserts, a round tube in side a twisted square tube and spiraled tube in side the annulus have been used to enhance heat transfer in the annulus of tube-in-tube heat exchangers. The heat transfer enhancement in the shell can be supplemented by heat transfer augmentation in tubes using twisted tape inserts or micro-finned tubes. The effect of the thermal resistance of the condensing refrigerant could also be taken into consideration. To assess the benefit of using these techniques extended performance evaluation criteria have been implemented at dif

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3

Borg, Ulf, Emmet Bolger, and Sean Morris. "Does Cuff Design Impact Insertion and Removal Force of Tracheostomy Tubes? A Bench Model." Military Medicine 188, Supplement_6 (2023): 629–33. http://dx.doi.org/10.1093/milmed/usad286.

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ABSTRACT Introduction Percutaneous dilatational tracheostomy is a commonly performed procedure in intensive care units. Unrecognized tracheal ring fracture has been suggested as a possible factor for tracheal stenosis. The degree of tracheal compression relates to the amount of force required to cannulate the trachea. The objective of this study was to determine the force required to insert two types of tracheostomy tubes with different cuff designs. Materials and Methods This bench model measured the insertion and removal force of two tracheostomy tubes; one with a barrel-shaped, high-volume,

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4

Nimish, Dubey Mr. Morrish Kumar. "DESIGN MODIFICATION IN HEAT EXCHANGER TWISTED TAPE FOR HEAT TRANSFER ENHANCEMENT- A REVIEW." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 7 (2017): 1–5. https://doi.org/10.5281/zenodo.822920.

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Heat exchangers are very much essential industrial as well as domestic equipment used every day. Overall performance of any machine and many systems as a whole depends on the performance of a heat exchanger. To improve the performance of a heat exchanger it is needed to improve the heat transfer phenomena of a tube. Number of researches has been done to develop devices or means to enhance the performance of a heat exchanger. The most successful development of a component for the most efficient enhancement of heat exchanger performance is development of twisted tape inserts for heat exchanger t

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Hossain, Mohammad Taukir, Nesar Ali, and Muhammad Sadekul Karim. "Enhancement of Heat Transfer in a Rouletted Copper Tube Employing Delta Winglet Twirled Type Insert." European Journal of Engineering Research and Science 3, no. 5 (2018): 47. http://dx.doi.org/10.24018/ejers.2018.3.5.743.

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Heat transfer is a process or a system of thermal engineering that concerns the generation, use, conversion, transfer, internal or external molecular formation and exchange of thermal energy (heat) between physical systems. The research work has been experimented for the turbulent flow heat transfer in a tube having delta winglet twisted tape and then separately with water as working fluid. The test section consisted of a circular copper tube of 26.6 mm inner diameter, 900 mm length with five K-type thermocouples. Bulk temperature and pressure drops have been measured. Material of both the del

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Hossain, Mohammad Taukir, Nesar Ali, and Muhammad Sadekul Karim. "Enhancement of Heat Transfer in a Rouletted Copper Tube Employing Delta Winglet Twirled Type Insert." European Journal of Engineering and Technology Research 3, no. 5 (2018): 47–51. http://dx.doi.org/10.24018/ejeng.2018.3.5.743.

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Heat transfer is a process or a system of thermal engineering that concerns the generation, use, conversion, transfer, internal or external molecular formation and exchange of thermal energy (heat) between physical systems. The research work has been experimented for the turbulent flow heat transfer in a tube having delta winglet twisted tape and then separately with water as working fluid. The test section consisted of a circular copper tube of 26.6 mm inner diameter, 900 mm length with five K-type thermocouples. Bulk temperature and pressure drops have been measured. Material of both the del

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7

B Ch, Nookaraju, Dhanuri Bharath Yadav, Kotholla Raghavendar, et al. "Experimental & numerical investigation of heat transfer using twisted tapes with rectangular cuts." E3S Web of Conferences 552 (2024): 01010. http://dx.doi.org/10.1051/e3sconf/202455201010.

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The current work focuses on using rectangular inserts with water as the working fluid to investigate heat transfer experimentally and numerically in a horizontal circular tube [10]. The study considers variations in the number of rectangular slots within the same strip. The tube has dimensions of 0.0266 m diameter. Twisted tapes, featuring rectangular cuts, are constructed from a 3 mm thick Stainless-steel strip with a length of 1035 mm. For experimentation, two different types of rectangular inserts were considered: one with nine cuts and the other with eighteen cuts. The dimensions of the cu

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8

Seryam, Udit, Aseem C. Tiwari, and Jeetendra Kushwaha. "Comparative Experimental Study on Effect of Copper Wire Helical Wound Steel Tube with 2.5” Full Length Insert on Performance of Double Pipe Steel Tube Heat Exchanger." International Journal for Research in Applied Science and Engineering Technology 11, no. 8 (2023): 306–19. http://dx.doi.org/10.22214/ijraset.2023.55198.

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Abstract: A comparative experimental study was conducted to explore the hydrothermal behavior of a double tube heat exchanger with copper wire helical wound steel tubes and plane steel tubes with and without twisted tap inserts of pitch length 2.5 inches. In comparison to helical tubes, corrugated tubes, and many other more compact tube type heat exchangers, straight tube heat exchangers offer advantages since the construction of the heat exchanger tubes is easier. In the current work, the fluid-to-fluid heat exchange is considered, with a flow rate ranging from 15 to 75 liters/hour. Constant

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9

Paneliya, Sagar, Parth Prajapati, Umang Patel, et al. "Experimental and CFD analysis on heat transfer and fluid flow characteristic of a tube equipped with variable pitch twisted tape." E3S Web of Conferences 116 (2019): 00058. http://dx.doi.org/10.1051/e3sconf/201911600058.

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In this paper, we report an experimental and Computational Fluid Dynamics (CFD) investigation on the overall heat transfer coefficient, friction factor and effectiveness of a tube equipped with classic and variable twisted tape inserts. Constant (Y = 4.0) and variable pitch twisted inserts (Y = 4-3-4) made of Stainless Steel and Aluminium were used during the experiments due to their ease in machinability. Resistance thermometers were used to measure temperature of the working fluid at the inlet and outlet of the test section. It was observed that the twisted tape in the tube imposes the turbu

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10

Ahmed, Md Shamim, and Mohammad Zoynal Abedin. "Review on Heat Transfer Enhancement by Insert Devices." International Journal of Engineering Materials and Manufacture 5, no. 4 (2020): 130–47. http://dx.doi.org/10.26776/ijemm.05.04.2020.03.

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The scientists revise the heat transfer enhancement techniques time to time to achieve better performance and to obtain optimized designs of heat exchangers. The present study reviews the performance and techniques of heat transfer enhancement using various insert devices such as twisted tape and wire coil insert as well as completely different forms of other inserts like air-foil shape inserts, X-shaped twisted tape inserts, baffles and V-winglets inserts with various types of medium and nanofluids. According to the summary of recent significant researches on the heat transfer enhancement by

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11

Roslim, M. K., Suhaimi Hassan, and K. Izzati. "Experimental and Simulation Study on the Effects of Twisted Coil Plates on the Performance of Fire Tube Boiler." Applied Mechanics and Materials 564 (June 2014): 234–39. http://dx.doi.org/10.4028/www.scientific.net/amm.564.234.

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Influences of twisted coil plate insert on the performance of fire tube boiler using were experimentally investigated. In this study, the twisted coil plate was placed inside the tube to illustrate boiler performance. The performances of boiler were studied in terms of operating time taken, exhaust flue gas temperature, steam temperature and boiler efficiency. The boiler was operated with 50%, 100% and without tube coil plate inserts at low and high fire burner setting. Based on the results obtained, effect of twisted plate insert and without insert were observed. There is an enhancement in bo

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12

Syed, Naveedul Hasan, Naseer Ahmed Khan, Naveed Ahmad, et al. "A CFD Analysis to Investigate the Effect of Inserts on the Overall Heat Transfer Coefficient in a Concentric Tube Heat Exchanger." Engineering, Technology & Applied Science Research 14, no. 6 (2024): 18077–85. https://doi.org/10.48084/etasr.8891.

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In the present study, a U-bend concentric tube heat exchanger has been modeled using Computational Fluid Dynamics (CFD) through ANSYS Fluent software to study the influence of different variables on the overall heat transfer coefficient (U). Following the successful validation of the CFD model, an analysis was conducted to examine the impact of five distinct star-shaped inserts on U enhancement in the U-bend concentric tube heat exchanger. The analysis demonstrated that the maximum U values, which were 381.21 W/m²K and 468.96 W/m²K, were attained at a hot water flow rate of 0.007 L/s when 14 m

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13

Agrebi, Senda, Juan P. Solano, Ali Snoussi, and Ammar Ben Brahim. "Local entropy generation rate through convective heat transfer in tubes with wire coil inserts." International Journal of Numerical Methods for Heat & Fluid Flow 26, no. 5 (2016): 1365–79. http://dx.doi.org/10.1108/hff-12-2014-0374.

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Purpose – The purpose of this paper is to present a numerical analysis of the flow and heat transfer in a tube with a wire coil insert. A second law analysis of the results is accounted for, in order to assess the local and overall entropy generation in relation with the increased pressure drop and convective heat transfer. A wire coil with p/D=1.25 and e/D=0.076 is selected as insert device. A Reynolds number range between 100 and 1,000 is investigated, which corresponds to the typical operating regimes in the risers of liquid solar collectors. Different wall heat fluxes and inclination angle

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14

Ashham, M. A., S. H. Raheemah, and K. Salman. "Numerical investigation on enhancement of heat transfer using rod inserts in single pipe heat exchanger." Journal of Mechanical Engineering and Sciences 13, no. 4 (2019): 6112–24. http://dx.doi.org/10.15282/jmes.13.4.2019.24.0480.

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The current study focused on statistically investigating nanofluids’ turbulent flow and rate of heat transfer in double pipe heat exchanger with rod inserts. Through the use of numerical simulation, the effects which the various kinds of nanofluids have on the enhancement of heat transfer using finite volume method (FVM) are studied. An application of homogeneous heat flux is made to the tube wall. More so, an examination of the effect of three varying slant angles of rod insert (α = 25°, 30°, 45°) was carried out at varying Reynolds number ranging from 7500 - 20000. The statistical results re

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15

Oni, Taiwo O. "CFD Study of Behavior of Transition Flow in Distinct Tubes of Miscellaneous Tape Insertions." HighTech and Innovation Journal 3, no. 2 (2022): 130–39. http://dx.doi.org/10.28991/hij-2022-03-02-02.

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Application of transition flow can be found in several processes and systems. It has been revealed through findings from various researchers that the values of Reynolds numbers at which transition flow occurs vary. In the current work, investigations were numerically conducted by Fluent on transition of water flow in three assorted plain tubes fitted with miscellaneous tape insertions. They are plain tube with crossed-axes-circle-cut tape insert (C-C tube), plain tube with crossed-axes-triangle-cut tape insert (C-T tube), and plain tube with crossed-axes-ellipse-cut tape insert (C-E tube). The

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16

Qasim, M. S., S. G. Ali, and B. Freegah. "Conical Spring Inserts Effect on the Thermo- hydraulic Characteristics in Circular Copper Tube." IOP Conference Series: Materials Science and Engineering 1182, no. 1 (2021): 012065. http://dx.doi.org/10.1088/1757-899x/1182/1/012065.

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Abstract Experimental and numerical investigation was conducted to study the thermo-hydraulic characteristics in circular tube fitted with conical spring inserts. The dimensions of circular copper tube are 100cm, 2.2cm and 2.4 cm which represent the length, inner and outer diameters respectively. The length of insert was 15cm, while the conical spring has 16mm diameter gradually decreases to 6mm with the length and the pitch between the coils was 20mm. The diameter of wire used to fabricate the conical spring insert was 4mm. Those inserts were arranged into eight categories (A1 to A8). In the

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17

Daheriya, Sharad Kumar. "Comparative Experimental Study and Performance Intensification of Heat Exchanger by 55° Corrugated Tube and Twisted Tape Inserts of Pitch Length 1.5." International Journal for Research in Applied Science and Engineering Technology 13, no. 4 (2025): 1182–93. https://doi.org/10.22214/ijraset.2025.68399.

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The principal objective of this comparative experimental analysis is to determine the straight 55° corrugated steel tube heat exchanger is more beneficial to utilize than a standard straight steel tube heat exchanger. Straight tubes make heat exchanger tube fabrication easier. As a result, helical tubes and numerous other smaller tube forms of heat exchangers are inferior to straight tube heat exchangers. Most research on heat transfer coefficients is done for constant heat flow or constant wall temperature, while more recent work considers fluid-to-fluid heat exchange. In parallel flow and co

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18

Buenting, J. E., R. M. Dalston, T. L. Smith, and A. F. Drake. "Artifacts associated with acoustic rhinometric assessment of infants and young children: a model study." Journal of Applied Physiology 77, no. 6 (1994): 2558–63. http://dx.doi.org/10.1152/jappl.1994.77.6.2558.

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The present study was undertaken to determine in model studies whether currently available acoustic rhinometry instrumentation might be used to analyze the nasal cavity configuration of infants and children. A simple nasal cavity model was constructed using eight Lucite inserts that were placed between standard nosepieces provided by the manufacturer and a 35-cm-long polyvinyl chloride pipe closed at its distal end. To simulate the nasal valve, the inserts were 12 mm in length and had apertures ranging in diameter from 2 to 9 mm. A series of experiments was conducted to evaluate the accuracy w

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19

Kapse, Arvind A., Vinod C. Shewale, Sanjay D. Barahate, Amol B. Kakade, and Satish J. Surywanshi. "Experimental Investigation of Heat Transfer and Pressure Drop Performance of a Circular Tube with Coiled Wire Inserts." Engineering, Technology & Applied Science Research 14, no. 1 (2024): 12512–17. http://dx.doi.org/10.48084/etasr.6551.

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This paper evaluates the thermo-hydraulic performance of a coiled wire passive insert for internal turbulent flow through a circular copper tube test section in an in-tube exchanger. Experiments were carried out using water as the working fluid with Reynolds number ranging from 8000 to 32000. The experimental setup was validated for Nusselt number and friction factor with well-established equations for plain tubes. The average Nusselt number ratios (Nua/Nup) and the friction factor ratios (fa/fp) for the augmented tube case over the plain tube case are reported to range from 1.55 to 1.38 and f

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20

Mogaji, Taye Stephen, Emmanuel Tolulope Idowu, and Tien-Chien Jen. "Numerical Simulation for Comparative Thermo-Hydraulic Performance of Turbulent Flow in Tubes with Twisted Tape Inserts." Journal of Engineering Science 16, no. 2 (2020): 71–100. http://dx.doi.org/10.21315/jes2020.16.2.4.

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This article focused on investigating numerically the effects of key design parameters including tape thickness, tube wall to tape edge clearance and three different perforated shapes cut (circular, triangular and pentagon) on the heat transfer coefficient enhancement in tube with twisted tape inserts. Water was considered as the working fluid under the turbulent flow of Reynolds number (Re) between 12,000 and 22,000, with constant wall temperature of the tubes. It is found that due to the swirling flow and efficient mixing of the fluid, all the tape inserts considered in this study produced b

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21

Kapse, A. A., P. R. Dongarwar, and R. R. Gawande. "Effect of Helical Screw Tape Insertion on Heat Transfer and Pressure Drop Characteristics in a Horizontal Concentric Double Tube Heat Exchanger." Applied Mechanics and Materials 541-542 (March 2014): 622–27. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.622.

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In the present work, the effects of insertion of helical screw tape on heat transfer characteristics and pressure drop in a concentric double tube heat exchanger are experimentally investigated. The heat exchanger has the outer (steel) and inner (copper) tube diameters of 50 mm and 25 mm respectively. The helical screw tape of diameter 19 mm is inserted into the inner tube to increase turbulence which helped to increase the heat transfer rate. The hot water was flowed through the inner tube and cold water was flowed in annulus. The helical screw tape was inserted in 1/3rd length and full lengt

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22

Yu, Tian Lan, De Qi Peng, Tian Xiang Yu, et al. "Fouling Removal Technology with Intermittent Rotation Spiral-Insert." Advanced Materials Research 535-537 (June 2012): 2252–56. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.2252.

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An intermittent rotation steel spiral automatic cleaning technology has been developed to address the fouling problem of the condenser tubes in small turbines. The intermittent rotation structure reduces steel spiral rotating speed to less than 1/10 of the continuous rotation spiral, which solves the wearing problems between the spiral and the tube. The results of a series of experiments showed that: the proposed technology meets the requirements of cleaning the hard fouling, and the heat transfer enhancement effect is significantly improved. The technology’s simple structure and low cost are

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23

Somanchi, Naga Sarada, Sri Rama R. Devi, and Ravi Gugulothu. "Experimental Investigations on Heat Transfer Enhancement in a Horizontal Tube Using Converging and Diverging Conical Strip Inserts." Applied Mechanics and Materials 592-594 (July 2014): 1590–95. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1590.

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The present work deals with the results of the experimental investigations carried out on augmentation of turbulent flow heat transfer in a horizontal circular tube by means of tube inserts, with air as working fluid. Experiments were carried out initially for the plain tube (without tube inserts). The Nusselt number and friction factor obtained experimentally were validated against those obtained from theoretical correlations. Secondly experimental investigations using three kinds of tube inserts namely Rectangular bar with diverging conical strips, Rectangular bar with converging conical str

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24

Dzyubenko, Boris V., and Guenrikh A. Dreitser. "3.23.2 TWISTED TUBE HEAT EXCHANGERS: FLOW MODELS FOR TWISTED TUBE HEAT EXCHANGERS." Heat Exchanger Design Updates 10, no. 4 (2003): 6. http://dx.doi.org/10.1615/heatexchdesignupd.v10.i4.50.

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Dzyubenko, Boris V., and Guenrikh A. Dreitser. "3.23.1 TWISTED TUBE HEAT EXCHANGERS: TYPICAL CONFIGURATIONS OF TWISTED TUBE HEAT EXCHANGERS." Heat Exchanger Design Updates 10, no. 4 (2003): 2. http://dx.doi.org/10.1615/heatexchdesignupd.v10.i4.40.

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26

Lunyaka, K. V., O. I. Kliuiev, S. A. Rusanov, and O. O. Kliuieva. "STUDY OF THE INFLUENCE OF THE TUBE POSITION IN THE TUBE BUNDLE OF THE SHELL AND TUBE HEAT EXCHANGER ON THE PROCESS OF HEAT TRANSFER." Scientific Bulletin Kherson State Maritime Academy 1, no. 22 (2020): 99–108. http://dx.doi.org/10.33815/2313-4763.2020.1.22.099-108.

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The paper is concerned with an issue of liquid distribution in the diametrical bank tubes of the shell and tube heat exchanger. The experimental-theoretical approach for the research has been applied. The data on the determination of velocities of the heated liquid through the pipes of the heat exchanger have been obtained and processed. The research was carried out at the created experimental factory. Water at a temperature of 20 ºС has been supplied to the tubes. The temperature of the water has been maintained by a thermostat. The temperature at the outlet of the tube has been measured with

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27

Mozaffari, Javad, Seyed Mirjalily, and Amir Ahrar. "Experimental investigation of enhancing influence of Al2O3 nanoparticles on the convective heat transfer in a tube equipped with twisted tape inserts." Thermal Science, no. 00 (2019): 414. http://dx.doi.org/10.2298/tsci181010414m.

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In this study, the heat transfer rate of Al2O3/Water nanofluid flow in a tube with twisted tape inserts is examined, experimentally. The twisted tape insert can cause a swirling region in the fluid flow which will enhance the heat transfer coefficient. On the other hand, the twisted tape inserts have a great influence on the pressure drop. It is known that nanoparticles and twisted tape inserts may both increase the heat transfer rate of the fluid. Thus, in this study, it is tried to demonstrate the combined effect of both phenomena, experimentally. In this way, the Al2O3/Water nanofluid is us

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28

riyam ali and Khudheyer Salim. "A Computational Study for Evaluating the Performance of Twisted Double Tube Heat Exchangers Fitted with Twisted Tape." CFD Letters 16, no. 5 (2024): 21–36. http://dx.doi.org/10.37934/cfdl.16.5.2136.

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Twisted double-tube heat exchangers are promising in improving the heat transfer efficiency on the tube side, decreasing the pressure drop on the shell side, and reducing the size of the equipment. Although offering immense potential, examining heat transfer enhancement techniques inside a heat exchanger. In this study, The thermal-hydraulic characteristics of twisted double-tube heat exchangers fitted with twisted tape inserted have been numerically studied. The Naiver-stokes, energy, and turbulence equations were used to model the fluid flow and heat transfer while the turbulence was with a

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29

Payman, Adele R., and Dan M. Goebel. "Development of a 50-A heaterless hollow cathode for electric thrusters." Review of Scientific Instruments 93, no. 11 (2022): 113543. http://dx.doi.org/10.1063/5.0124694.

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Hollow cathodes in electric thrusters normally use an external heater to raise the thermionic electron emitter to emission temperatures. These heaters are a potential single-point failure in the thruster and add a separate power supply to the power processing unit. Heaterless hollow cathodes are attractive for their compact size and potential higher reliability but have only been reliably demonstrated to date in small hollow cathodes capable of discharge currents below around 5 A. A new heaterless LaB6 hollow cathode has been developed that is capable of discharge currents from 5 to 50 A. The

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30

Gawande, K. R., and A. V. Deshmukh. "Experimental Investigation of Heat Transfer Rate Using Twisted Tape with Elliptical Holes." IRA-International Journal of Technology & Engineering (ISSN 2455-4480) 7, no. 2 (S) (2017): 105. http://dx.doi.org/10.21013/jte.icsesd201711.

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An experimental investigation was carried for measuring tube-side heat transfer coefficient, friction factor, heat transfer enhancement efficiency of water for turbulent flow in a circular tube fitted with rectangular-cut twisted tape insert. A copper tube of 26.6 mm internal diameter and 30 mm outer diameter and 900 mm test length was used. A stainless steel rectangular-cut twisted tape insert of 5.25 twist ratio was inserted into the smooth tube. The rectangular cut had 8 mm depth and 14 mm width. A uniform heat flux condition was created by wrapping nichrome wire around the test section and

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31

Mustaghfirin, M. Anis, Burniadi Moballa, and Syaifullah Hamim Thohari. "Effect of various number conical strip inserted in the tube on heat transfer performance." MATEC Web of Conferences 204 (2018): 04016. http://dx.doi.org/10.1051/matecconf/201820404016.

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This work, fluid flow and heat transfer in single and multi phase flow chould be enhanced by turbulent flow in heat exchanger tube with one of heat transfer augmentation techniques. Characteristic of globular tube fitted with the multiple conical strips insert were investigated. Most of study are related with this work, they found that an addition by single conical strips insert will make nusselt number increase 5%. Unfortunately, it was also increase pressure drop about 10%. This work improve their work by adding amount of conical strips inserts.The modification that will become 4 variation n

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32

Peng, De Qi, Wei Qiang Wang, Tian Lan Yu, Biao Wei, Yu Zhou, and Jia Shi Tang. "3D Numerical Simulation of Fluid Flow and Heat Transfer for Asymmetric Spiral-Gear Inserts in a Tube." Applied Mechanics and Materials 130-134 (October 2011): 1686–90. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1686.

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For solving cleaning fouling online for shell-and-tube heat exchanger，an asymmetric spiral-gear cleaning technology is presented. The RNGk-εturbulent model is used to simulate the fluid flow and heat transfer of the tube with the spiral-gear. Its velocity and turbulent intensity field, convection heat transfer characteristic and resistance property are analyzed. Numerical simulation results shows that radial velocity is larger in the annular area near the tube wall than that in the smooth tube. Tangential velocity in the diameter area corresponding to the width of spiral-gear insertion increas

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33

Wilday, A. J., and C. J. Weil. "4.17.2 HEAT EXCHANGER SAFETY: SHEL-AND-TUBE HEAT EXCHANGERS: TUBE SIDE FA1LURE AND RELIEF." Heat Exchanger Design Updates 9, no. 3-4 (2002): 15. http://dx.doi.org/10.1615/heatexchdesignupd.v9.i3-4.30.

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Kapse, Arvind, Prashant Dongarwar, and Rupesh Gawande. "Thermohydraulic performance comparision of compound inserts for a turbulent flow through a circular tube." Thermal Science 21, no. 3 (2017): 1309–19. http://dx.doi.org/10.2298/tsci151027096k.

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Heat transfer and pressure drop characteristics of three different passive inserts are experimentally investigated for individual and compound insertion. Insert cross-section is altered along the length of test section for compound insertion. Test runs were conducted in a concentric circular tube in tube heat exchanger in the Reynolds number range of 8000 to 32000 with water as a working fluid. Enhancements in Nusselt number and friction factors are reported to be in the range of 38-234% and 55-524%, respectively, over plain tube. The average performance ratios based on equal pumping power are

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35

Goebel, Dan M., and Adele R. Payman. "Heaterless 300 A lanthanum hexaboride hollow cathode." Review of Scientific Instruments 94, no. 3 (2023): 033506. http://dx.doi.org/10.1063/5.0135272.

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Hollow cathodes used in electric propulsion typically have an external heater to raise the thermionic electron emitter to emission temperatures. Heaterless hollow cathodes that are heated by a Paschen discharge have been historically limited to low discharge currents (<5 A) due to arcing and inefficient heating. A new heaterless technology was previously developed for cathodes up to 50 A, utilizing a refractory metal tube to extend the gas feed line partway into the thermionic insert region. A high voltage (>700 V) Paschen discharge is ignited between the keeper and the tube, which quick

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Kholodnaya, G. E., R. V. Sazonov, D. V. Ponomarev, G. E. Remnev, and A. A. Vikanov. "Influence of current – conducting inserts in a drift tube on transportation of a pulsed electron beam at gigawatt power." Laser and Particle Beams 33, no. 4 (2015): 749–54. http://dx.doi.org/10.1017/s0263034615000762.

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AbstractThis paper describes the results of experimental research on the influence of the current-conducting inserts in a drift tube on transportation of a pulsed electron beam at gigawatt power and nanosecond duration. The experimental investigation was conducted using a TEU–500 laboratory-pulsed electron accelerator (parameters of the accelerator: Up to 550 keV; output electron current: 11.5 kA; pulse duration (at half-height): 60 ns; pulse frequency: 5 pulses/s; pulse energy: Up to 280 J). Air was chosen as the propagation medium. The pressure in the drift tube is 50 Torr. It is revealed th

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Venkatesaperumal, Ramalingam, Kutbudeen Syed Jafar, Perumal Venkatesan Elumalai, et al. "Heat Transfer Studies on Solar Parabolic trough Collector Using Corrugated Tube Receiver with Conical Strip Inserts." Sustainability 15, no. 1 (2022): 378. http://dx.doi.org/10.3390/su15010378.

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The heat transfer characteristics of the working fluid passing through the absorber of a solar parabolic trough collector (SPTC) can be enhanced by the creation of a turbulence effect. Therefore, a novel idea was implemented by introducing a corrugated tube (CT) absorber instead of a plain tube absorber in a solar parabolic trough collector. The heat transfer enhancement was improved further through the use of conical strip inserts inside the corrugated tube absorber of the SPTC. A corrugated tube (CT) receiver with a pitch of 8 mm and corrugation height of 2 mm was used with three different p

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Jasiński, Piotr Bogusław. "Numerical Study of Heat Transfer Intensification in a Circular Tube Using a Thin, Radiation-Absorbing Insert. Part 2: Thermal Performance." Energies 14, no. 15 (2021): 4533. http://dx.doi.org/10.3390/en14154533.

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This article is the second part of the work under the same title, which is based on the results of the research presented in the previous article: “Numerical study of heat transfer intensification in a circular tube using a thin, radiation-absorbing insert. Part 1: Thermo-hydraulic characteristics”. Part 1 presents an analysis of pressure drops and heat transfer intensification in a round tube with an insert, using the phenomenon of radiation absorption. In this paper, an analysis of the tested insert’s thermal performance (PEC) is presented, taking into account the criterion of equal pumping

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Jasiński, Piotr Bogusław. "Numerical Study of Heat Transfer Intensification in a Circular Tube Using a Thin, Radiation-Absorbing Insert. Part 1: Thermo-Hydraulic Characteristics." Energies 14, no. 15 (2021): 4596. http://dx.doi.org/10.3390/en14154596.

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The presented paper, which is the first of two parts, shows the results of numerical investigations of a heat exchanger channel in the form of a cylindrical tube with a thin insert. The insert, placed concentrically in the pipe, uses the phenomenon of thermal radiation absorption to intensify the heat transfer between the pipe wall and the gas. Eight geometric configurations of the insert size were numerically investigated using CFD software, varying its diameter from 20% to 90% of the pipe diameter and obtaining the thermal-flow characteristics for each case. The tests were conducted for a ra

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Pandey, Lokesh, and Satyendra Singh. "Numerical Analysis for Heat Transfer Augmentation in a Circular Tube Heat Exchanger Using a Triangular Perforated Y-Shaped Insert." Fluids 6, no. 7 (2021): 247. http://dx.doi.org/10.3390/fluids6070247.

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The present investigation constitutes CFD analysis of the heat transmission phenomenon in a tube heat exchanger with a Y-shaped insert with triangular perforation. The analysis is accomplished by considering air as a working fluid with a Reynolds number ranging from 3000 to 21,000. The segment considered for analysis consists of a circular tube of 68 mm diameter and 1.5 m length. The geometrical parameter considered is the perforation index (0%, 10%, 20%, and 30%). The constant heat flux is provided at the tube wall and a pressure-based solver is used for the solution. The studies are performe

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Imam Assyafiq Syahputra, Moh, Gaguk Marausna, and Joni Kasmara. "STUDI INVESTIGASI PERFORMA HEAT EXCHANGER DENGAN MEMANFAATKAN GAS BUANG GUNA MENGATASI ICING PADA KARBURATOR PESAWAT PISTON ENGINE." Teknika STTKD: Jurnal Teknik, Elektronik, Engine 7, no. 1 (2021): 38–49. http://dx.doi.org/10.56521/teknika.v7i1.265.

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Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh perubahan variasi geometri vortex generator twisted tape insert terhadap koefisien perpindahan kalor menyeluruh, pressure drop, dan efektifitas heat exchanger dalam memanaskan udara yang akan digunakan untuk mengatasi icing pada karburator. Penelitian ini menggunakan engine genset 1 silinder berkapasitas 2000 W yang disimulasikan sebagai pengganti piston engine pesawat sebagai penghasil gas buang dan dengan variasi pembebanan menggunakan lampu pijar sebesar 0 W sampai 400 W serta variasi twist yang dikondisikan dalam heat exchanger s

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Deng, Shifeng, Huaishuang Shao, Jian Jiao, Teng Qu, and Qinxin Zhao. "Heat transfer enhancement in inserted extruded aluminum finned tubes." Thermal Science, no. 00 (2022): 200. http://dx.doi.org/10.2298/tsci220708200d.

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Heat transfer enhancement in tubes is widely applied in various industrial processes. The traditional method of heat transfer enhancement is to insert radial fins to expand the internal surface area and destroy the flow. However, there is a flue gas corridor in the central area of the tube, and the cost of expanding the inner fin is high. A centrally symmetrical bent extruded aluminum fin was developed to enhance the heat transfer in the tube. An experimental platform was constructed to test the performance of inner finned tubes and explore the process of combining extruded aluminum inner fin

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Wijayanta, Agung Tri, Budi Kristiawan, Pranowo, Agung Premono, and Muhammad Aziz. "Computational Fluid Dynamics Analysis of an Enhanced Tube with Backward Louvered Strip Insert." Energies 12, no. 17 (2019): 3370. http://dx.doi.org/10.3390/en12173370.

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A computational solution of an enhanced tube equipped with a backward louvered strip insert with various pitches was evaluated in this work. A k-ε renormalized group turbulence model has been applied for the turbulent model. Different pitches, S, of 40, 50, and 60 mm were investigated for the Reynolds number with a range of 10,000–17,500 using water as a working fluid. The extra louvered strip caused fluid flow disturbance, so that the flow pattern formed more turbulence. The turbulent flow was characterized by the flow pattern on the back of the inserts that form a vortex. The vortices formed

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Chaudhary, Rishu. "Comparing Different Methods of Nasogastric Tube Insertion in Anaesthetized Patients: A Critical Review." Himalayan Journal of Medicine and Surgery 03, no. 02 (2022): 1–3. https://doi.org/10.47310/hjms.2022.v03i02.005.

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It can be challenging to insert nasogastric tubes (NGTs) using a traditional technique in anaesthetized, intubated patients. NGT insertion methods have been tested with various degrees of success. This review's objective was to compare the different approaches to the standard procedure in terms of success rate, insertion time, and adverse events. Several techniques of nasogastric tube (NGT) insertion have been described in the literature with different success rates. The literature suggests that the use of modified techniques of NGT insertion such as the reverse Sellick's maneuver, neck flexio

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Ardeta, Louise Grace Avena, and Bonifacio Doma, Jr. "Numerical Analysis of Passive, Compound, and Active Augmented Heat Transfer Methods for Concentric Tube Heat Exchanger." Applied Sciences 15, no. 9 (2025): 4701. https://doi.org/10.3390/app15094701.

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Passive, compound, and active augmented heat transfer (AHT) methods in a countercurrent flow concentric tube heat exchanger (CCTHE) were explored and examined in this work. The finite volume method using ANSYS Fluent 2021 R2 was applied to evaluate the fluid flow and heat transfer characteristics of a CCTHE in each AHT study. The influence of the circular perforated insert at varied quantities (N) was analyzed in a passive AHT study. A comparable heat transfer improvement of 41.8% was recorded at an insert quantity of N = 7; however, a notable decreasing trend in the thermal performance factor

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Gareeboo, Shafick, and Suveer Singh. "Tube thoracostomy: how to insert a chest drain." British Journal of Hospital Medicine 67, Sup1 (2006): M16—M18. http://dx.doi.org/10.12968/hmed.2006.67.sup1.20339.

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Tabatabaeikia, S., H. A. Mohammed, N. Nik-Ghazali, and B. Shahizare. "Heat Transfer Enhancement by Using Different Types of Inserts." Advances in Mechanical Engineering 6 (January 1, 2014): 250354. http://dx.doi.org/10.1155/2014/250354.

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Heat transfer enhancement has been always a significantly interesting topic in order to develop high efficient, low cost, light weight, and small heat exchangers. The energy cost and environmental issue are also encouraging researchers to achieve better performance than the existing designs. Two of the most effective ways to achieve higher heat transfer rate in heat exchangers are using different kinds of inserts and modifying the heat exchanger tubes. There are different kinds of inserts employed in the heat exchanger tubes such as helical/twisted tapes, coiled wires, ribs/fins/baffles, and w

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Akgul, Dogan, Safak Metin Kirkar, Busra Selenay Onal, Ali Celen, Ahmet Selim Dalkilic, and Somchai Wongwises. "Single-phase flow heat transfer characteristics in helically coiled tube heat exchangers." Kerntechnik 87, no. 1 (2022): 1–25. http://dx.doi.org/10.1515/kern-2021-1005.

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Abstract The aim of this review is to present a summary of the published papers of the heat transfer and pressure drop characteristics for single-phase flow in helically coiled tubes. The effect of geometrical parameters such as curvature ratio, coil pitch and working conditions such as Reynolds number, Dean number, flow rate and flow arrangement on heat transfer and pressure drop in helically coiled tubes are determined in the light of the experimental, numerical and analytical studies in the literature. Also, the effect of using nanofluids in comparison with conventional fluids, using enhanc

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Hanoon, Murtadha, Mohsen Fagr, and Kamaal Mekki. "Flow and heat transfer augmentation using helical coiled wire of different cross-sections." Al-Qadisiyah Journal for Engineering Sciences 18, no. 2 (2025): 202–10. https://doi.org/10.30772/qjes.2024.145936.1081.

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In this numerical investigation, the effectiveness of utilizing advanced helical coiled wires (HCWs) as tube inserts for the purpose of heat transfer and turbulence enhancement under turbulent flow conditions (Reynolds numbers: 3000-11000) was examined. HCW followed a helical guide path instead of a straight one in a typical coiled wire case, resulting in increased flow complexity. Circular and equilateral triangular wires, maintaining equal cross-sectional areas, were tested, with pitch ratios (P/D) being 1, 1.5, and 2. Simulation was performed using ANSYS Fluent 22, the working fluid conside

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Stoian, Elena Valentina, Maria Cristiana Enescu, Ivona Camelia Petre, Ruxandra Elena Bratu, Vasile Bratu, and Carmen Otilia Rusanescu. "Experimental Researches on the Behavior of Polypropylene Pipes at the Physical-mechanical Testing." Materiale Plastice 57, no. 2 (2019): 23–31. http://dx.doi.org/10.37358/mp.20.2.5347.

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Lately, PP-R pipes have become increasingly popular in terms of drinking water installations and heating. Comparated to the classic pipes from copper or steel, pipes from propylene are much easier to use, they have obvious qualities and they are marketed at a much lower price. The study aims a comparative analysis of the physical-mechanical properties of the four most common types of pipes from propylene, which are currently found in commerce : simple without insertion(PP-R), with insert of composite fiber (PP-R-CF), with insert of basalt fiber (PP-R-BF) and with insert of aluminium (PP-R-AIF)

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