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Journal articles on the topic 'Coiled tubes'

Author: Grafiati

Published: 6 September 2023

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1

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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2

Abdul- Kareem R. Abed, Hassan Jawdat Fadhiel, Gaydaa Mahsun, and Thabet C. Yassen. "Experimental Study on The Effect of Capillary Tube Geometry on The Performance of Vapour Compression Refrigeration System." Diyala Journal of Engineering Sciences 7, no. 2 (2014): 47–60. http://dx.doi.org/10.24237/djes.2014.07204.

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A domestic refrigerator of 5 ft3 capacity is used to study the effect of coiled diameter and pitch distance of a capillary tube. Five capillary tubes of 2 mm in diameter and 1500 mm length each are used, as same as original capillary tube of the refrigerator. The capillary tubes is formed in five shapes, each one has different coil diameter (D) namely 25, 50, 75, 100 and 125 mm in diameter, in addition three distances between each coil (pitch (P)) is tested, namely 6, 8 and 10 mm. The pressure at inlet and outlet of capillary are measured to calculate the cycle COP, as well as the power consum

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3

INOUE, NORIHIRO, SHINITSU IKU, and KAZUHIDE WATANABE. "PRESSURE DROP AND HEAT TRANSFER INSIDE THE COILED FLOW CHANNEL OF SMOOTH TUBES AND INTERNALLY HELICAL-GROOVED TUBES." International Journal of Air-Conditioning and Refrigeration 20, no. 04 (2012): 1250023. http://dx.doi.org/10.1142/s201013251250023x.

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In this study, we investigated ways of improving the performance of heat exchangers, which are the heat pumps for use in hot-water supply systems on the hot-water supply side. Therefore, we verified experimentally the pressure drop and the heat transfer characteristics within the coiled flow channel. Five smooth copper tubes and five internally helical-grooved copper tubes with an outside diameter of 12.7 mm and coil diameters of 100 mm, 120 mm, 140 mm, 160 mm and 180 mm were used as the heat-transfer coiled tubes in the experiments. Experiments were conducted under conditions of constant isot

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4

Dey, Anshumaan, and Monisha M. Mandal. "Hydrodynamics Study of Oil–Water Flow in Coiled Flow Inverter." Advanced Science, Engineering and Medicine 12, no. 2 (2020): 173–80. http://dx.doi.org/10.1166/asem.2020.2485.

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The present numerical study is an effort to examine the hydrodynamics characteristics of two immiscible liquids (oil and water) flowing in different tubes. i.e., straight, coiled and Coiled Flow Inverter (CFI) tube of equal dimensions. CFI is a novel device in which fluid flow inversion takes place at uniform interval length of tube. The effect of oil-water viscosity ratio (µoil/µwater = 1.6 and 30) on velocity contours, phase distribution and pressure drop in the different tubes were investigated. The present work show that flow pattern of oil–water flows was changed from stratified to annula

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5

Akeedy, Adnan Rasheed, Hajar Alias, and Sami D. Salman. "HEAT TRANSFER ENHANCEMENT USING PASSIVE TECHNIQUE: REVIEW." Jurnal Teknologi 83, no. 2 (2021): 151–62. http://dx.doi.org/10.11113/jurnalteknologi.v83.14546.

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Preserving and saving energy have never been more important, thus the requirement for more effective and efficient heat exchangers has never been more important. However, in order to pave the way for the proposal of a truly efficient technique, there is a need to understand the shortcomings and strengths of various aspects of heat transfer techniques. This review aims to systematically identify these characteristics two of the most popular passive heat transfer techniques: nanofluids and helically coiled tubes. The review indicated that nanoparticles improve thermal conductivity of base fluid

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6

Gao, Weikai, Xiaoyang Xie, Xiaowei Li, and Xinxin Wu. "Influence of Coiling Direction of Helical Tube Bundles on the Thermal-Hydraulics of the HTGR Steam Generator." Journal of Physics: Conference Series 2048, no. 1 (2021): 012032. http://dx.doi.org/10.1088/1742-6596/2048/1/012032.

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Abstract Helical tube bundles were usually adopted in the steam generators (SGs) or intermediate heat exchangers (IHXs) of high temperature gas-cooled reactors (HTGRs). Heat transfer tubes in neighboring tube layers can be coiled in the same direction or in the opposite direction. The coiling direction has influences on the thermal-hydraulic performances of the SGs or IHXs. The cross flow convection over helical tube bundles with neighboring tube layers having the same coiled direction and opposite coiled direction were numerically investigated. Reynolds stress model with standard wall functio

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7

Garimella, S., D. E. Richards, and R. N. Christensen. "Experimental Investigation of Heat Transfer in Coiled Annular Ducts." Journal of Heat Transfer 110, no. 2 (1988): 329–36. http://dx.doi.org/10.1115/1.3250488.

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Forced convection heat transfer in coiled annular ducts was investigated experimentally. Average heat transfer coefficients were obtained for both laminar and transition flows. Two coiling diameters and two annulus radius ratios were used in the study. The data were correlated with Dean number and Reynolds number separately and compared with the available studies of coiled circular tubes and straight annular ducts. It was found that coiling augments the heat transfer coefficients above the values for a straight annulus especially in the laminar region. However, the augmentation is less than wo

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8

Haryoko, Luthfi A. F., Jundika C. Kurnia, and Agus P. Sasmito. "Numerical Investigation of Subcooled Boiling Heat Transfer in Helically-Coiled Tube." International Journal of Automotive and Mechanical Engineering 17, no. 1 (2020): 7675–86. http://dx.doi.org/10.15282/ijame.17.1.2020.15.0570.

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Subcooled boiling heat transfer in helically-coiled tubes offers better heat transfer performance than any other types of boiling processes due to its ability to capture high heat flux with a relatively low wall superheat. This study investigates turbulent subcooled forced convection boiling performances of water-vapour in a helically-coiled tube with various operating conditions i.e. operating pressure, heat, and mass flux. Developed CFD model is validated against previously published experimental results using the RPI model. The model is developed based on the Eulerian-Eulerian framework cou

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Mishani, Siamak, Brian Evans, Vamegh Rasouli, Reem Roufail, Soren Soe, and Peter Jaensch. "Interlaminar modelling to predict composite coiled tube failure." APPEA Journal 55, no. 1 (2015): 361. http://dx.doi.org/10.1071/aj14029.

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In a field operation that uses coiled tubing in its applications, fibre-reinforced polymer matrix composite tubing is seldom used. Fibre-composite coiled tubes offer advantages, compared to steel material, through a reduction in weight and improvement in fatigue life. The stiffness of composite material degrades progressively when increasing the number of cyclic loading. The fatigue damage and failure criteria of fibre-reinforced composite coiled tubes are more complex than that of steel; hence, failure predictions are somewhat unreliable. Among the defects in composite materials, interlaminar

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10

Quinlan, R. A., and M. Stewart. "Crystalline tubes of myosin subfragment-2 showing the coiled-coil and molecular interaction geometry." Journal of Cell Biology 105, no. 1 (1987): 403–15. http://dx.doi.org/10.1083/jcb.105.1.403.

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We have produced crystalline tubes of chicken breast myosin long subfragment-2 that show order to resolutions better than 2 nm. The tubes were formed from a thin sheet in which the myosin long subfragment-2 molecules were arranged on an approximately rectangular crystalline lattice with a = 14.1 +/- 0.2 nm and b = 3.9 +/- 0.1 nm in projection. Shadowing indicated that the tube wall was approximately 7 nm thick and that the sheets from which it was formed followed a right-handed helix. Superposition of the lattices from the top and bottom of the tube produced a moire pattern in negatively stain

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11

Gordon, PA, JM Norton, JM Guerra, and ST Perdue. "Positioning of chest tubes: effects on pressure and drainage." American Journal of Critical Care 6, no. 1 (1997): 33–38. http://dx.doi.org/10.4037/ajcc1997.6.1.33.

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BACKGROUND: Maintaining a chest drainage tube in a position that is free of dependent loops, as is commonly recommended, can be very difficult. Is there a beneficial effect on the patient's outcome when the drainage tubing is free of dependent loops? OBJECTIVE: The purpose of this study was to determine, under controlled laboratory conditions, (1) what are the differences in drainage with tubing in straight, coiled, or dependent-loop (with and without periodic lifting) positions and (2) what are the differences in pressure with each of the four tubing conditions? METHODS: In laboratory simulat

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12

Grabezhnaya, V., A. Mikheyev, A. Alekhin, A. Kryukov, and A. Tikhomirov. "EXPERIMENTAL JUSTIFICATION OF DESIGN CHARACTERISTICS OF STEAM GENERATOR RP BREST-OD-300." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2021, no. 2 (2021): 218–35. http://dx.doi.org/10.55176/2414-1038-2021-2-218-235.

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The project BREST-OD-300 reactor plant (RP) with a fast neutron reactor and a lead coolant in the primary circuit is being developed in NIKIET JSC. As a steam generator (SG), a helical-type steam generator with coiled tubes with subcritical pressure water in the second circuit is considered. To substantiate the design characteristics of the secondary coolant at the State Research Center of the Russian Federation - IPPE, thermohydraulic tests of various SG models were carried out at the SPRUT stand Initially, tests were carried out on a model of a coiled steam generator consisting of two three-

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13

Higueras-Ruiz, Diego R., Michael W. Shafer, and Heidi P. Feigenbaum. "Cavatappi artificial muscles from drawing, twisting, and coiling polymer tubes." Science Robotics 6, no. 53 (2021): eabd5383. http://dx.doi.org/10.1126/scirobotics.abd5383.

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Compliant, biomimetic actuation technologies that are both efficient and powerful are necessary for robotic systems that may one day interact, augment, and potentially integrate with humans. To this end, we introduce a fluid-driven muscle-like actuator fabricated from inexpensive polymer tubes. The actuation results from a specific processing of the tubes. First, the tubes are drawn, which enhances the anisotropy in their microstructure. Then, the tubes are twisted, and these twisted tubes can be used as a torsional actuator. Last, the twisted tubes are helically coiled into linear actuators.

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14

Grabezhnaya, V., and A. Mikheyev. "EXPERIMENTAL STUDY OF THERMAL HYDRAULICS ON THE MODEL OF HELICAL COILED STEAM GENERATOR HEATED BY LIQUID LEAD WITH LONGITUDINAL AND TRANSVERSE FLOW." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2019, no. 1 (2019): 132–51. http://dx.doi.org/10.55176/2414-1038-2019-1-132-151.

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The study of heat transfer in spiral coiled tubes is of great interest in view of the widespread use of such channels in engineering practice, in particular, in nuclear power engineering in the form of steam generators at research reactors and nuclear power plants. In the projected BREST-OD-300 reactor facility (RF), a configuration of helical coiled tubes is considered as a steam generator. Thermal hydraulic tests of the model steam generator RF BREST-OD-300 (version 2000) with helical coiled tubes with longitudinal coolant flow were carried out in SSC RF - IPPE at the SPRUT facility in 2011-

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15

Rasti, Mehdi, and Ji Hwan Jeong. "Assessment of Dimensionless Correlations for Prediction of Refrigerant Mass Flow Rate Through Capillary Tubes — A Review." International Journal of Air-Conditioning and Refrigeration 25, no. 04 (2017): 1730004. http://dx.doi.org/10.1142/s201013251730004x.

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Capillary tubes are widely used as expansion devices in small-capacity refrigeration systems. Since the refrigerant flow through the capillary tubes is complex, many researchers presented empirical dimensionless correlations to predict the refrigerant mass flow rate. A comprehensive review of the dimensionless correlations for the prediction of refrigerants mass flow rate through straight and coiled capillary tubes depending on their geometry and adiabatic or diabatic capillary tubes depending on the flow configurations has been discussed. A comprehensive review shows that most of previous dim

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16

Vinn, Olev. "Tube ultrastructure of the fossil genus Rotularia Defrance, 1827 (Polychaeta, Serpulidae)." Journal of Paleontology 82, no. 1 (2008): 206–12. http://dx.doi.org/10.1666/06-125.1.

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Among Polychaete annelids, calcareous tubes occur in Serpulidae, Spirorbidae, Sabellidae, and Cirratulidae (Perkins, 1991; Fischer et al., 2000). The tubes of most serpulids are completely or partially cemented to the substrate. The fossil genus Rotularia has a peculiar unattached, spirally coiled tube, thus well distinguishable from the other known serpulids. Tube records of Rotularia are known from Mesozoic (Late Jurassic) (Ball, 1960; Stevens, 1967) to Early Tertiary sediments, becoming very common during the Cretaceous and Eocene (see Savazzi, 1995). It also has a global distribution (Wrig

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17

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 r

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18

Li, Zhaoxu, Shengyao Jiang, Xingtuan Yang, et al. "Bubbly-intermittent flow transition in helically coiled tubes." Chemical Engineering Journal 323 (September 2017): 96–104. http://dx.doi.org/10.1016/j.cej.2017.04.029.

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19

Prabhanjan, Devanahalli G., Timothy J. Rennie, and G. S. Vijaya Raghavan. "Natural convection heat transfer from helical coiled tubes." International Journal of Thermal Sciences 43, no. 4 (2004): 359–65. http://dx.doi.org/10.1016/j.ijthermalsci.2003.08.005.

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20

Sharma, Loveleen, K. D. P. Nigam, and Shantanu Roy. "Single phase mixing in coiled tubes and coiled flow inverters in different flow regimes." Chemical Engineering Science 160 (March 2017): 227–35. http://dx.doi.org/10.1016/j.ces.2016.11.034.

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21

Bozzoli, Fabio, Luca Cattani, Sara Rainieri, Fermín S. V. Bazán, and Leonardo S. Borges. "Estimation of the local heat transfer coefficient in coiled tubes." International Journal of Numerical Methods for Heat & Fluid Flow 27, no. 3 (2017): 575–86. http://dx.doi.org/10.1108/hff-03-2016-0097.

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Purpose Most of the passive techniques for enhancing heat transfer inside pipes (e.g. rough surfaces, swirl-flow devices and coiled tubes) give origin to an irregular distribution of the heat transfer coefficient at the fluid–wall interface along the wall perimeter. This irregular distribution could be critical in some industrial applications, but most of the available research papers, mainly due to the practical difficulty of local measuring heat flux on the internal wall surface of a pipe, present the results only in terms of Nusselt number averaged along the wall circumference. This paper a

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22

Elshamy, Samir M., Mohamed T. Abdelghany, M. R. Salem, and O. E. Abdellatif. "Energy and Exergy Analysis of Shell and Coil Heat Exchanger Using Water Based Al2O3 Nanofluid Including Diverse Coil Geometries: An Experimental Study." Journal of Nanofluids 9, no. 1 (2020): 13–23. http://dx.doi.org/10.1166/jon.2020.1727.

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The aim of this research is to investigate experimentally the characteristics of the convective heat transfer and exergy analysis of pure water and water based Al2O3 nanofluid through helical coiled tubes (HCTs) and conical coiled tubes (CCTs) inside shell and coil heat exchangers. HCT and CCT fabricated with different coil torsions (λ) ranges from 0.0202 to 0.052 with different two angles (0° and 45°) while have the same curvature ratio (δ = 0.0564). The effects of mean coil torsion, the cone angle and nanoparticles volume concentration on the thermal performance were investigated. Results in

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Blackbourn, H. D., and A. P. Jackson. "Plant clathrin heavy chain: sequence analysis and restricted localisation in growing pollen tubes." Journal of Cell Science 109, no. 4 (1996): 777–86. http://dx.doi.org/10.1242/jcs.109.4.777.

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Clathrin-coated vesicles were isolated from soybean (Glycine max L.) cells in suspension culture and their purity was assessed using SDS-PAGE, peptide sequencing and electron microscopy. Antibodies raised to these coated vesicles were used to immunoscreen a soybean cDNA library in lambda gt11 and isolate a partial clone of the clathrin heavy chain (HC) gene. Full-length cDNA for soybean clathrin HC was deduced by 5′ and 3′ cDNA amplification. The cDNA encodes an amino acid sequence of 1,700 residues, which is slightly larger than rat clathrin HC and may account for the reduced mobility of plan

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Hewitt, G. F., and S. Jayanti. "Prediction of film inversion in two-phase flow in coiled tubes." Journal of Fluid Mechanics 236 (March 1992): 497–511. http://dx.doi.org/10.1017/s0022112092001502.

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Depending on the flow conditions, the liquid film in annular two-phase flow in coiled tubes may be pushed towards the outer or the inner side by the centrifugal force. It is important to understand the mechanism of this ‘film inversion’ in order to develop a predictive model for the film thickness distribution. In this paper, this phenomenon is studied analytically, and a new criterion, based on the secondary flow in the thin liquid film, is proposed to predict its occurrence. The criterion shows good agreement with available experimental data. It is suggested that the analytical model can rea

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He, Jinjing, Jingwen Gong, Qingqing Zheng, and Jin Jiang. "Repositioning of the Severe Prolapsed Silicone Tubes after Bicanalicular Nasal Intubation: A Novel Technique." Journal of Ophthalmology 2021 (March 6, 2021): 1–6. http://dx.doi.org/10.1155/2021/6669717.

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Background. Bicanalicular nasal intubation is widely used in lacrimal drainage system surgery. Its common complication is lateral displacement or spontaneous prolapse. When the distal part of the silicone tubes cannot be seen in the nose endoscopically, either repositioning or removal could be a challenge. We developed a simple technique to reposition the severe prolapsed silicone tubes. Method. This retrospective study included 6 patients with severe prolapsed silicone tubes who had undergone bicanalicular nasal intubation between January 2017 and December 2019. We used a memory wire probe to

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26

Grabezhnaya, V., A. Mikheyev, and A. Kryukov. "ON THE EFFECT OF OXYGEN IMPURITIES ON HEAT TRANSFER AT TRANSVERSAL FLOW OF STEAM-GENERATING TUBES IN NORMAL HEAT TRANSFER MODES AND WITH LEAD FREEZE." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2020, no. 3 (2020): 135–47. http://dx.doi.org/10.55176/2414-1038-2020-3-135-147.

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The BREST-OD-300 steam generator project being developed at NIKIET is pioneering both in terms of the heat carrier used (lead) and in design implementation (coils of helical heat transfer tubes). The advantages of the designs of steam generators made in the form of helical coiled tubes, in comparison with straight tube designs are obvious. Helical coiled tubes are used in heat exchange equipment not only to increase the heat transfer surface, to solve the problem of thermal expansion, but also to increase the coefficient of heat transfer to the fluid flowing inside the tubes. In 2011-2017 year

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Ji, Cui Lian, Ji Tian Han, Chang Nian Chen, Xia Dong, and Ling Jian Kong. "Influence of Geometry Parameters on Critical Heat Flux in Helically Coiled Tubes: Development of Correlation." Applied Mechanics and Materials 353-356 (August 2013): 3077–80. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.3077.

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Based on 2006 look-up tables to analysis the effect of pipe diameters on CHF, the correlations are established for horizontal helically coiled tube by introducing equivalent geometrical parameter. According to experimental data, it is found that the correlation is very suitable, and the regularity of horizontal helically coiled tube geometry parameters on CHF tends to be consistent with that of a vertical tube.

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Chung-Szu Wei, Yur-Tsai Lin, Chi-Ch. "A Performance Comparison Between Coiled and Straight Capillary Tubes." Heat Transfer Engineering 21, no. 2 (2000): 62–66. http://dx.doi.org/10.1080/014576300271031.

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Acharya, Narasimha, Mihir Sen, and Chang Hsueh-Chia. "Heat transfer enhancement in coiled tubes by chaotic mixing." International Journal of Heat and Mass Transfer 35, no. 10 (1992): 2475–89. http://dx.doi.org/10.1016/0017-9310(92)90090-f.

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Acharya, Narasimha, Mihir Sen, and Chang Hsueh-Chia. "Thermal entrance length and Nusselt numbers in coiled tubes." International Journal of Heat and Mass Transfer 37, no. 2 (1994): 336–40. http://dx.doi.org/10.1016/0017-9310(94)90105-8.

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Ma, Weimin, Mingyuan Zhang, and Xuejun Chen. "High-quality critical heat flux in horizontally coiled tubes." Journal of Thermal Science 4, no. 3 (1995): 205–11. http://dx.doi.org/10.1007/bf02650830.

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Hart, J., J. Ellenberger, and P. J. Hamersma. "Single- and two-phase flow through helically coiled tubes." Chemical Engineering Science 43, no. 4 (1988): 775–83. http://dx.doi.org/10.1016/0009-2509(88)80072-1.

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Zhou, Guobing, and Yufeng Zhang. "Inlet pressure fluctuation characteristics of coiled adiabatic capillary tubes." Applied Thermal Engineering 33-34 (February 2012): 183–89. http://dx.doi.org/10.1016/j.applthermaleng.2011.09.033.

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Nada, S. A., W. G. El Shaer, and A. S. Huzayyin. "Performance of multi tubes in tube helically coiled as a compact heat exchanger." Heat and Mass Transfer 51, no. 7 (2014): 973–82. http://dx.doi.org/10.1007/s00231-014-1469-z.

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DABAS, J. K., SUDHIR KUMAR, A. K. DODEJA, and K. S. KASANA. "MODELING OF A HELICALLY COILED HFC134a EVAPORATOR." International Journal of Air-Conditioning and Refrigeration 22, no. 03 (2014): 1450016. http://dx.doi.org/10.1142/s2010132514500163.

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A computer simulation model has been developed for the performance analysis and design optimization of a helical coil and cylindrical shell type evaporator working with HFC-134a by using the appropriate empirical correlations of heat transfer coefficient and pressure drop in the helical tubes as available in the literature. This model is based on a numerical method of cell discretization of shell side and tube side of the evaporator. The local values of variables are calculated and the mass, momentum and energy balance is applied to each small cell. The whole sequential and iterative procedure

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Elsayed, A., R. K. Al-dadah, S. Mahmoud, and A. Rezk. "Experimental and theoretical investigation of small-scale cooling system equipped with helically coiled evaporator and condenser." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 3 (2011): 724–37. http://dx.doi.org/10.1177/0954406211414790.

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Utilizing helically coiled tubes evaporator and condenser in cooling applications is promising due to their higher heat transfer coefficients compared to straight tube because of the effect of centripetal forces. With growing interest in miniature and efficient refrigeration systems, small helical coil diameter can offer significant advantages in terms of being compact, lightweight, and improved coefficient of performance (COP). This article describes a performance study of small-scale vapour compression cooling system (100 W cooling capacity) equipped with shell and helically coiled tube evap

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KAEW-ON, JATUPORN, SAKARIN CHINGULPITAK, and SOMCHAI WONGWISES. "EXPERIMENTAL INVESTIGATION OF R134a FLOWING THROUGH ADIABATIC HELICALLY COILED CAPILLARY TUBES." International Journal of Air-Conditioning and Refrigeration 20, no. 01 (2012): 1250001. http://dx.doi.org/10.1142/s2010132512500010.

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The effects of the relevant parameters on the flow characteristic of R134a flowing through adiabatic helical capillary tubes were experimentally studied. The capillary tubes' diameter, coil diameter, and parameters relating to flow conditions such as inlet pressures and degree of subcooling were the major parameters investigated. The test section was made from copper tubing with inner diameters of 1.07, 1.27, and 1.62 mm. The coil diameters were 25, 50, and 100 mm. The local pressure and temperature distributions along the length of the capillary tubes were measured at inlet pressures ranging

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Bhangle, Ms K. P. "CFD Analysis of the Optimization of Length of Capillary Tube for a Vapor Compression Refrigeration System." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (2021): 2567–78. http://dx.doi.org/10.22214/ijraset.2021.37780.

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Abstract: The capillary tube is commonly employed in refrigerant flow control systems. As a result, the capillary tube's performance is optimal for good refrigerant flow. Many scholars concluded performance utilising experimental, theoretical, and analysis-based methods. This paper examines the flow analysis of a refrigerant within a capillary tube under adiabatic flow circumstances. For a given mass flow rate, the suggested model can predict flow characteristics in adiabatic capillary tubes. In the current work, R-134a refrigerant has been replaced by R600a refrigerant as a working fluid insi

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Elamin, M. R., Babiker Y. Abdulkhair, and Kamal K. Taha. "Effect of Urea on the Shape and Structure of Carbon Nanotubes." Zeitschrift für Naturforschung A 73, no. 2 (2018): 113–20. http://dx.doi.org/10.1515/zna-2017-0288.

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AbstractCoiled multiwall carbon nanotubes (MWCNTs) were prepared on Fe, Co, and Ni metal oxides supported on α-Al2O3 using urea as fuel and catalyst surface modifying agent by catalytic chemical vapour deposition (CCVD). The shape of the nanotubes was influenced by the addition of urea, where coiled and uncoiled tubes were obtained in the presence and absence of urea, respectively. The MWCNTs were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen adsorption analysis. The coiling/uncoiling of the nanotubes was v

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Lara, Caique, Julie Villamil, Anthony Abrahao, et al. "Development of an Innovative Inspection Tool for Superheater Tubes in Fossil Fuel Power Plants." Materials Evaluation 79, no. 7 (2021): 728–38. http://dx.doi.org/10.32548/2021.me-04212.

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Fossil fuel power plants are complex systems containing multiple components that require periodic health monitoring. Failures in these systems can lead to increased downtime for the plant, reduction of power, and significant cost for repairs. Inspections of the plant’s superheater tubes are typically manual, laborious, and extremely time-consuming. This is due to their small diameter size (between 1.3 and 7.6 cm) and the coiled structure of the tubing. In addition, the tubes are often stacked close to each other, limiting access for external inspection. This paper presents the development and

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Williams, EG, V. Kaul, JL Rouse, and BF Palser. "Overgrowth of Pollen Tubes in Embryo Sacs of Rhododendron Following Interspecific Pollinations." Australian Journal of Botany 34, no. 4 (1986): 413. http://dx.doi.org/10.1071/bt9860413.

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Frequent overgrowths of pollen tubes within the embryo sac are characteristic of a number of interspecific crosses in the genus Rhododendron (Ericaceae). The combined techniques of sectioning, squashing and whole-ovule clearing have confirmed that in ovules showing this phenomenon the pollen tube fails to terminate growth and release sperms on entry into a synergid; instead it continues to grow beyond the synergid and egg cell, often filling the main body of the embryo sac with a coiled and distorted mass. Such ovules fail to develop further. The occurrence and possible causes of this error sy

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Yoon, Dong-Hyeog, Ju-Yeop Park, and Kwang-Won Seul. "Numerical Study of Turbulent Heat Transfer in Helically Coiled Tubes." Transactions of the Korean Society of Mechanical Engineers B 36, no. 8 (2012): 783–89. http://dx.doi.org/10.3795/ksme-b.2012.36.8.783.

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Kaji, Masou, Koji Mori, Shigeyasu Nakanishi, Kentaro Hirabayasi, and Masaya Ohishi. "Dryout and Wall Temperature Fluctuations in Helically Coiled Evaporating Tubes." Transactions of the Japan Society of Mechanical Engineers Series B 61, no. 585 (1995): 1811–17. http://dx.doi.org/10.1299/kikaib.61.1811.

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Kanatani, Kentaro, Takashi Yamamoto, Yutaka Tamaura, and Hiroshige Kikura. "A model of a solar cavity receiver with coiled tubes." Solar Energy 153 (September 2017): 249–61. http://dx.doi.org/10.1016/j.solener.2017.05.061.

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KANATANI, Kentaro, Takashi YAMAMOTO, Yutaka TAMAURA, and Hiroshige KIKURA. "A model of a solar cavity receiver with coiled tubes." Proceedings of Mechanical Engineering Congress, Japan 2017 (2017): J0540103. http://dx.doi.org/10.1299/jsmemecj.2017.j0540103.

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Ali, Mohamed E. "Laminar natural convection from constant heat flux helical coiled tubes." International Journal of Heat and Mass Transfer 41, no. 14 (1998): 2175–82. http://dx.doi.org/10.1016/s0017-9310(97)00322-0.

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Ali, Mohamed E. "Experimental investigation of natural convection from vertical helical coiled tubes." International Journal of Heat and Mass Transfer 37, no. 4 (1994): 665–71. http://dx.doi.org/10.1016/0017-9310(94)90138-4.

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Zhu, Guangyu, Xingtuan Yang, Shengyao Jiang, and Hongye Zhu. "Intermittent gas-liquid two-phase flow in helically coiled tubes." International Journal of Multiphase Flow 116 (July 2019): 113–24. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2019.04.013.

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Redlinger-Pohn, Jakob D., Lukas A. Jagiello, Wolfgang Bauer, and Stefan Radl. "Mechanistic understanding of size-based fiber separation in coiled tubes." International Journal of Multiphase Flow 83 (July 2016): 239–53. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2016.04.008.

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Bozzoli, F., L. Cattani, A. Mocerino, and S. Rainieri. "Turbulent flow regime in coiled tubes: local heat-transfer coefficient." Heat and Mass Transfer 54, no. 8 (2017): 2371–81. http://dx.doi.org/10.1007/s00231-017-2127-z.

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