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Articles de revues sur le sujet « Overall heat transfer coefficient »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 26 juillet 2025

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1

Ozturk, Ali. "Overall Heat Transfer Coefficient of Functionally Graded Hollow Cylinder." Solid State Phenomena 267 (October 2017): 177–81. http://dx.doi.org/10.4028/www.scientific.net/ssp.267.177.

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This paper presents how to calculate the overall heat transfer coefficient of a very long functionally graded hollow circular cylinder subjected to steady state heat transfer. Thermal conductivity coefficient of the functionally graded cylinder (FGC) vary radially and continuously according to an exponential form, which is supposed to be independent of the temperature. Overall heat transfer coefficient is found analytically in terms of the radial coordinate, thermal conductivity, material parameter, inner surface and outer surface temperatures of the cylinder. Once the overall heat transfer co

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Taslim, M. E., and V. Nezym. "A New Statistical-Based Correlation for the Rib Fin Effects on the Overall Heat Transfer Coefficient in a Rib-Roughened Cooling Channel." International Journal of Rotating Machinery 2007 (2007): 1–11. http://dx.doi.org/10.1155/2007/68684.

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Heat transfer coefficients in the cooling cavities of turbine airfoils are greatly enhanced by the presence of discrete ribs on the cavity walls. These ribs introduce two heat transfer enhancing features: a significant increase in heat transfer coefficient by promoting turbulence and mixing, and an increase in heat transfer area. Considerable amount of data are reported in open literature for the heat transfer coefficients both on the rib surface and on the floor area between the ribs. Many airfoil cooling design software tools, however, require an overall average heat transfer coefficient on

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Ohashi, Yuta, Ryota Tsuchiya, Masahisa Ishii, and Makio Hayashi. "Greenhouse Covering Material Overall Heat-transfer Coefficient Determination Using Contour Plots." HortScience 60, no. 2 (2025): 235–36. https://doi.org/10.21273/hortsci18217-24.

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Improving greenhouse heat-insulating performance requires covering materials with low overall heat-transfer coefficients. We constructed a contour plot using equations relating this coefficient to longwave radiation absorptance under different outdoor downward longwave radiation levels. It revealed that the coefficient ranged from 4.7 to 7.7 W·m−2·K−1, decreasing with increasing downward longwave radiation and longwave radiation absorptance. This method facilitates rapid estimation of overall heat-transfer coefficients under different downward longwave-radiation levels, based on longwave-radia

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Korprasertsak, Nataporn, and Thananchai Leephakpreeda. "Real-Time Determination of Overall Heat Transfer Coefficient from the Seebeck Effect by Using Adaptive Learning-Rate Optimization." E3S Web of Conferences 162 (2020): 01002. http://dx.doi.org/10.1051/e3sconf/202016201002.

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It is challenging to determine the actual overall heat transfer coefficient under thermal conditions during processes. In a conventional approach, they are obtained as a constant with the empirical formula for the given conditions. In this study, the Adaptive moment estimation (Adam) technique is investigated for adaptive learning-rate optimization in the real-time determination of the overall heat transfer coefficient via the Seebeck effect in the thermoelectric modules. Two thermoelectric modules detect heat transfer as solid surfaces exposed to the outdoor air. The principle of energy balan

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IORDACHE, Florin, and Florin Băltărețu. "About the overall heat transfer coefficient of plate heat exchangers." Revista Romana de Inginerie Civila/Romanian Journal of Civil Engineering 16, no. 2 (2025): 216–24. https://doi.org/10.37789/rjce.2025.16.2.10.

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Li, Haowei, Guowei Lin, Qing Xu, Xiaojia Fang, and Shengxian Xian. "Overall Heat Transfer Coefficient Evaluation Method for Uncracked Hydrocarbon Fuel in a Regeneratively-Cooled Heat Exchanger of a Scramjet." Applied Sciences 12, no. 13 (2022): 6590. http://dx.doi.org/10.3390/app12136590.

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Regenerative cooling is critical for the thermal protection of hypersonic propulsion systems, wherein the flow and heat transfer characteristics of the hydrocarbon fuel in the cooling channel are crucial. Restricted by measurement, the distribution of the fuel temperature inside the cooling channel cannot be directly detected. As a result, the measurement of the convective heat transfer coefficient is more an overall heat transfer coefficient. Furthermore, the existing overall heat transfer coefficient calculation method is derived without considering the flow state of the hydrocarbon fuel in

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Radulescu, Sinziana, Loredana Irena Negoita, and Ion Onutu. "Effective Overall Heat Transfer Coefficient Solver in a Triple Concentric-Tube Heat Exchanger." Revista de Chimie 70, no. 6 (2019): 2040–43. http://dx.doi.org/10.37358/rc.19.6.7271.

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A relation for calculation of the effective overall heat transfer coefficient in a triple concentric-tube heat exchanger is proposed. The relation of the effective overall heat transfer coefficient is obtained based on total thermal resistance and it is applied within a case study for thermal analysis of two triple concentric-tube heat exchangers with different geometries, hot fluids and operating conditions. Through case study it is found that the values of effective overall heat transfer coefficient can be obtained with acceptable errors, up to 3 % for both heat exchangers.

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Askarov, Dilmurod Bakhtiyor ugli. "FUNDAMENTALS OF DESIGN AND CALCULATION OF HEAT EXCHANGERS." Research Focus International Scientific Journal 2, no. 12 (2023): 154–58. https://doi.org/10.5281/zenodo.15043852.

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<strong>FUNDAMENTALS OF DESIGN AND CALCULATION OF HEAT EXCHANGERS</strong> <strong>Askarov Dilmurod Bakhtiyor ugli</strong> basic doctoral student, Namangan Institute of Engineering and Technology <strong>https://doi.org/10.5281/zenodo.15043852</strong> <strong>Abstract: </strong>Heat exchangers play a crucial role in various industrial applications by facilitating efficient heat transfer between two or more fluids. This paper presents the fundamental principles of heat exchanger design and calculation, focusing on hydrodynamic parameters, heat transfer coefficients, and overall thermal effici

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Shadabkhan, A. Pathan, and Yadav Sanjay. "Computational Fluid Dynamics Analysis on Performance of Heat Transfer in Shell and Tube Heat Exchanger using Nano Fluids." Research and Applications of Thermal Engineering 6, no. 1 (2023): 1–4. https://doi.org/10.5281/zenodo.7638528.

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<em>The simulations are carried out numerically to find out the effects like coefficient of heat transfer and pressure drop by using CFD. The heat transfer coefficient, pressure drop, overall heat transfer coefficient and performance factors are obtained. The CFD results of heat transfer coefficient, pressure drop and overall heat transfer coefficient are observed and compared with the experimental results. The transfer of heat to fluids and from fluids is vital between the basic operations in the industries. Heat exchangers enable efficient heat transfer between two mediums. In this way the t

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Popescu, Mirela, Tibor Bedo, and Bela Varga. "Determination of Overall Heat Transfer Coefficient by Simple Thermal Analyze." Scientific Bulletin of Valahia University - Materials and Mechanics 14, no. 11 (2016): 11–16. http://dx.doi.org/10.1515/bsmm-2016-0002.

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Abstract To know more precise the value of overall heat transfer coefficient is on a special importance to programs (software) that models the solidification process for project casting technology in order to optimize them by dimensioning and appropriate placement both the gating system and the risers for eliminate casting defects, shrinkages. The paper aims to determin the value of overall heat transfer coefficient on the cooling curve recorded in casting-solidification real conditions. The values obtained for the overall heat transfer coefficient (2.34 to 25.41) · 10−4 [cal/s.grad.cm2]) for

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Rodriguez-Cabal, M. A., A. Arias Londoño, J. G. Ardila-Marin, L. F. Grisales-Noreña, and A. Castro-Vargas. "Overall heat transfer coefficient optimization in a spiral-plate heat exchanger." Journal of Physics: Conference Series 1671 (October 2020): 012012. http://dx.doi.org/10.1088/1742-6596/1671/1/012012.

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Kondo, Masaya, Ayumu Nishida, and Jun Sugimoto. "ICONE23-2178 STUDY OF OVERALL HEAT TRANSFER COEFFICIENT FROM UPPER CRUST TO OVERLAYING WATER DURING MCCI." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–2—_ICONE23–2. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-2_69.

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Alsulaiei, Zaher Mohammed Abed, Haider Jabaur Abid, R. Shakir, and Hawra Salah Hamid Ajimi. "Forecast Study on the Overall Coefficient for Passage of Single-Phase and Passage of Single-Phase in an Annular to Plain Tubes Heat Stream." IOP Conference Series: Earth and Environmental Science 1223, no. 1 (2023): 012028. http://dx.doi.org/10.1088/1755-1315/1223/1/012028.

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Abstract To prevent buoyancy effects from increasing the overall heat transfer coefficient due to low heat flux, smooth vertical circular tubes require forced convection conjectures. Previous research has focused on mixed convection in turbulent regions and has limited studies on forced convective heat transfer. This study aims to investigate the predictable overall coefficients of heat transfer performance under specific conditions of forced convection, considering both vertical up flow and down flow through the smooth circular test section. The recommended Reynolds numbers for water are (720

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Nallusamy, S. "Characterization of Al₂O₃/Water Nanofluid through Shell and Tube Heat Exchangers over Parallel and Counter Flow." Journal of Nano Research 45 (January 2017): 155–63. http://dx.doi.org/10.4028/www.scientific.net/jnanor.45.155.

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Nanotechnology has become one of the fastest growing scientific and engineering disciplines. Nano fluids have been established to possess enhanced thermal and physical properties such as thermal conductivity, thermal diffusivity, viscosity and convective heat transfer coefficients. The aim of this research article is to analyze the overall heat transfer coefficient by doing an experimental investigation on the convective heat transfer and flow characteristics of a nano fluid. In this research, an attempt was made for the nano fluid consisting of water and 1% volume concentration of Al2O3/water

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Romanowicz, Tomasz, Jan Taler, Magdalena Jaremkiewicz, and Tomasz Sobota. "Determination of Heat Transfer Correlations for Fluids Flowing through Plate Heat Exchangers Needed for Online Monitoring of District Heat Exchanger Fouling." Energies 16, no. 17 (2023): 6264. http://dx.doi.org/10.3390/en16176264.

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This article deals with the problem of estimating the degree of fouling of plate heat exchangers (PHEs) used in district heating substations (where the working medium is water). A method for calculating the thermal resistance of fouling is proposed based on a comparison of the thermal resistance of a fouled and clean heat exchanger. The thermal resistance of the heat exchanger for both fouled and clean apparatuses is determined as the inverse of their overall heat transfer coefficient. In the method, the heat transfer coefficients necessary to determine the overall heat transfer coefficient of

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Prakashkumar, A. Prajapati Shri. A.S.Mohite. "An Experimental Analysis of The Overall Heat Transfer Coefficient On Cross Flow Heat Exchanger & Fin Effectiveness." International Journal of Research and Analytical Reviews 5, no. 3 (2018): 343–48. https://doi.org/10.5281/zenodo.10978645.

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As far modern requirement is to make a small car so there is an immediate need to design an effectively heated exchanger. In this paper, the impact of finned heated exchanger over a without finned heated exchanger on overall heated return coefficient is examined. The overall heated return coefficient is examined for both heated exchange with air rate 3m/s, 4m/s, 5m/s and 6m/s and coolant flow 180 Lit/hr, 260 Lit/ hr, 340 Lit/hr, 420 Lit/hr ad 500 Lit/hr. Finned-tube heated exchangers are common and important components in many energy methods Fin-and-tube heated exchang

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Chowdhury, Manojit, Ankita Banerjee, Rahul Das, Shrilekha Das, and Kamlesh Prasad. "Influence of Temperature and Mass Flow Rate on Heat Transfer Characteristics in Parallel Flow Corrugated Plate Heat Exchanger." Journal of Agricultural Engineering (India) 62, no. 1 (2025): 120–34. https://doi.org/10.52151/jae2025621.1917.

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Efficient heat exchangers (HEs) are essential components in various industrial processes, enabling transfer of thermal energy between fluids. Current research investigated heat transfer and fluid flow characteristics of a corrugated surface type parallel flow plate heat exchanger (PHE) with water as a heat transfer fluid. The study aims to enhance our understanding of how these operational parameters impact heat transfer performance and provide insights into optimizing the design and operation of such HEs for improved energy efficiency. The performance of HE was evaluated at variable temperatu

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18

Ren, Bin. "Heat transfer characteristics of a round block impervious graphite heat exchanger." Journal of Physics: Conference Series 2993, no. 1 (2025): 012016. https://doi.org/10.1088/1742-6596/2993/1/012016.

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Abstract The round block graphite heat exchanger is one of the three most popular types of impervious graphite heat exchangers with a market share of 50%. The heat transfer characteristic was experimentally studied. First, the effects of velocities of cold and hot medium on overall heat transfer coefficient were studied. Second, distributions of thermal resistance of hot medium, cold medium, graphite, and resin were illustrated. Finally, the Nusselt numbers for the shell and tube side were individually formulated based on the Reynolds and Prandtl number. The result shows that the overall heat

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Gopal, Arumugam, Prabhakaran Duraisamy, and Thirumarimurugan Marimuthu. "Experimental Investigation on Heat Transfer and Pressure Drop Characteristics of Food Additive in Dimple Plate Heat Exchanger." Revista de Chimie 73, no. 3 (2022): 97–109. http://dx.doi.org/10.37358/rc.22.3.8539.

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The present study attempts to examine the heat transfer and pressure drop aspects of a 11-channel dimple plate heat exchanger with hot water as the hot fluid and sodium benzoate (food preservative) as the cold fluid. The outcome of the mass flow rate of hot and cold fluids on the convective heat transfer coefficient and overall heat transfer coefficient were investigated. Furthermore, the effect of Reynolds number on the pressure drop and the Nusselt number were observed. The experimental results demonstrated that when the mass flow rate of the cold fluid increases, so does the overall heat tr

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Gubaidullin, A. A., and A. V. Pyatkova. "Influence of the heat transfer coefficient on heat transfer in a vibrating cylindrical cavity." Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki 167, no. 1 (2025): 16–29. https://doi.org/10.26907/2541-7746.2025.1.16-29.

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Heat transfer in a vibrating cylindrical air-filled cavity, where the heat flux on the walls is defined by the Newton–Richmann law, was studied numerically. To describe the process in an axisymmetric formulation, the full system of Navier–Stokes equations with constant values of the viscosity and thermal conductivity coefficients was used. Three characteristic vibration frequencies were considered. The influence of the heat transfer coefficient on the temperature distribution in the cavity was investigated. The findings show that when the heat transfer occurs through the cavity walls, vibratio

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G. Lee, H. E. Huff, and F. Hsieh. "OVERALL HEAT TRANSFER COEFFICIENT BETWEEN COOLING DIE AND EXTRUDED PRODUCT." Transactions of the ASAE 48, no. 4 (2005): 1461–69. http://dx.doi.org/10.13031/2013.19171.

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MORSY, M. G., F. M. WASSEF, V. H. MORCOS, and H. A. M. EL BIBLAWY. "OVERALL HEAT TRANSFER COEFFICIENT FOR A MULTI-TUBE ROTATING CONDENSER." Chemical Engineering Communications 57, no. 1-6 (1987): 41–49. http://dx.doi.org/10.1080/00986448708960474.

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KUMPINSK, ENIO. "EXPERIMENTAL DETERMINATION OF OVERALL HEAT TRANSFER COEFFICIENT IN JACKETED VESSELS." Chemical Engineering Communications 115, no. 1 (1992): 13–23. http://dx.doi.org/10.1080/00986449208936025.

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Qian, Xuejun, Seong W. Lee, and Yulai Yang. "Heat Transfer Coefficient Estimation and Performance Evaluation of Shell and Tube Heat Exchanger Using Flue Gas." Processes 9, no. 6 (2021): 939. http://dx.doi.org/10.3390/pr9060939.

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In the past few decades, water and air were commonly used as working fluid to evaluate shell and tube heat exchanger (STHE) performance. This study was undertaken to estimate heat transfer coefficients and evaluate performance in the pilot-scale twisted tube-based STHE using the flue gas from biomass co-combustion as working fluid. Theoretical calculation along with experimental results were used to calculate the specific heat of flue gas. A simplified model was then developed from the integration of two heat transfer methods to predict the overall heat transfer coefficient without tedious cal

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Baloyo, Jan Mary, and Yuyuan Zhao. "Heat Transfer Performance of Micro-Porous Copper Foams with Homogeneous and Hybrid Structures Manufactured by Lost Carbonate Sintering." MRS Proceedings 1779 (2015): 39–44. http://dx.doi.org/10.1557/opl.2015.699.

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ABSTRACTThe heat transfer coefficients of homogeneous and hybrid micro-porous copper foams, produced by the Lost Carbonate Sintering (LCS) process, were measured under one-dimensional forced convection conditions using water coolant. In general, increasing the water flow rate led to an increase in the heat transfer coefficients. For homogeneous samples, the optimum heat transfer performance was observed for samples with 60% porosity. Different trends in the heat transfer coefficients were found in samples with hybrid structures. Firstly, for horizontal bilayer structures, placing the high poro

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Sajjad, Muhammad, Hassan Ali, and Muhammad Kamran. "Thermal-hydraulic analysis of water based ZrO2 nanofluids in segmental baffled shell and tube heat exchangers." Thermal Science 24, no. 2 Part B (2020): 1195–205. http://dx.doi.org/10.2298/tsci180615291s.

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Thermal-hydraulic characteristics of water based ZrO2 nanofluids has been investigated in a segmental baffled shell and tube heat exchanger in turbulent flow regime. The effect of Reynolds number, nanoparticle loading, mass-flow rate, and tube lay-out has been analysed on overall heat transfer coefficient. The effect of Reynolds number on the tube side pressure drop and convective heat coefficient have also been discussed. The effect of shell side mass-flow rate was also investigated on shell side heat transfer coefficient determined using Bell-Delaware method. The nanoparticle volume concentr

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Apmann, Kevin, Ryan Fulmer, Branden Scherer, Sawyer Good, Jake Wohld, and Saeid Vafaei. "Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels." Nanomaterials 12, no. 4 (2022): 615. http://dx.doi.org/10.3390/nano12040615.

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The purpose of this paper is to investigate the effects of a connector between two microchannels, for the first time. A brief literature review is provided to offer a better understanding on the impacts of concentration and the characteristics of nanoparticles on thermal conductivity, viscosity, and, consequently, the heat transfer coefficient inside the microchannels. The given literature review aims to help engineer nanofluids to enhance the heat transfer coefficient inside the microchannels. In this research, Fe3O4 nanoparticles were introduced into the base liquid to enhance the heat trans

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Nikolaev, Alexander V., and Leonid M. Treyger. "Definition and analysis of overall heat-transfer coefficient at the sections of “hot” export petroleum pipeline operating in northern winter conditions." PROneft’. Proffessional’no o nefti 6, no. 3 (2021): 159–65. http://dx.doi.org/10.51890/2587-7399-2021-6-3-159-165.

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Background. Receiving information on overall heat-transfer coefficient of pipeline pumping down the heat oil is required for resolving a number of process challenges: definition of specific cooling-off intensity of delivered petroleum, optimization of delivery processes, insulation efficiency assessment of pipeline sections etc. Aim. The actual values of the heat transfer coefficients are the most reliable basis for the implementation of optimization and technological calculations during thermohydraulic modeling and development of measures (a) to save energy during hot pumping and (b) to incre

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Nikolaev, Alexander V., and Leonid M. Treyger. "Definition and analysis of overall heat-transfer coefficient at the sections of “hot” export petroleum pipeline operating in northern winter conditions." PROneft’. Proffessional’no o nefti 6, no. 3 (2021): 159–65. http://dx.doi.org/10.51890/2587-7399-2021-6-3-159-165.

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Background. Receiving information on overall heat-transfer coefficient of pipeline pumping down the heat oil is required for resolving a number of process challenges: definition of specific cooling-off intensity of delivered petroleum, optimization of delivery processes, insulation efficiency assessment of pipeline sections etc. Aim. The actual values of the heat transfer coefficients are the most reliable basis for the implementation of optimization and technological calculations during thermohydraulic modeling and development of measures (a) to save energy during hot pumping and (b) to incre

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Luo, Chao, Jun Zhao, and Weibin Ma. "Heat-transfer characteristics of ammonia-water falling film generation outside a vertical tube." Thermal Science 21, no. 3 (2017): 1251–59. http://dx.doi.org/10.2298/tsci150515183l.

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A heat transfer experimental of vertical out-tube falling film was conducted with different inlet spray density of ammonia-water solution and inlet hot water temperature. The inlet liquid mass concentration was selected as 60% of ammonia. The experiments showed that the overall heat transfer coefficient increases with the increase of inlet spray density and a maximum overall heat transfer coefficient could be obtained in an optimum spray density of ammonia-water solution, ?, between 0.26 and 0.29 kg/ms. The generation of ammonia vapor outside the vertical falling film had a similar trend with

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Porgar, Sajjad, Orhan Keklikcioglu, and Nese Keklikcioglu Cakmak. "Experimental thermal performance investigation of double pipe heat exchanger using MWCNT/water nanofluid." Energy Environment and Storage 3, no. 3 (2023): 96–104. http://dx.doi.org/10.52924/maus1078.

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This paper presents an experimental study investigating the thermal performance of multiwall carbon nanotubes in a twin-pipe heat exchanger using a water-based fluid. The research followed a two-step method, where a concentration of 0.01 weight percent of SDS surfactant was utilized to prepare the carbon nanotubes. The heat transfer coefficient, friction coefficient, and overall heat transfer coefficient of the nanofluid were compared to those of the base fluid. The results revealed that the addition of a small amount of multiwall carbon nanotubes significantly enhanced the thermal conductivit

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Fang, Jing, Kaixuan Li, and Mengyu Diao. "Establishment of the falling film evaporation model and correlation of the overall heat transfer coefficient." Royal Society Open Science 6, no. 5 (2019): 190135. http://dx.doi.org/10.1098/rsos.190135.

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In order to study the heat transfer of the falling film evaporator with phase change on both sides, in this paper we built the mathematical model and the physical model where the liquid film inside the tube is laminar and turbulent. The film thickness of the condensate at different axial positions, total condensate volume and velocity distribution, and temperature distribution of condensate outside the tube can be obtained by calculating the proposed model. Meanwhile, the liquid film thickness, velocity distribution and temperature distribution inside the tube were obtained by numerical simula

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Daloglu, Alican. "Study on overall heat transfer coefficient for a rotating cavity type heat exchanger." International Communications in Heat and Mass Transfer 26, no. 6 (1999): 861–67. http://dx.doi.org/10.1016/s0735-1933(99)00074-3.

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Biyanto, Totok Ruki, Enrico Kevin Gonawan, Gunawan Nugroho, Ridho Hantoro, Hendra Cordova, and Katherin Indrawati. "Heat exchanger network retrofit throughout overall heat transfer coefficient by using genetic algorithm." Applied Thermal Engineering 94 (February 2016): 274–81. http://dx.doi.org/10.1016/j.applthermaleng.2015.10.146.

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Perumal, Sakthivel, Dinesh Sundaresan, Rajkumar Sivanraju, Nega Tesfie, Kamalakannan Ramalingam, and Sathish Thanikodi. "Heat transfer analysis in counter flow shell and tube heat exchanger using of design of experiments." Thermal Science, no. 00 (2021): 77. http://dx.doi.org/10.2298/tsci200531077p.

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In this research aimed to estimate the Overall heat transfer coefficient of counter flow Shell and Tube heat exchanger. Heat transfer is the phenomenon to analysis of heat transfer from one medium of fluid to another medium of fluid, it is considered as a major role in industrial applications. Numerous heat exchangers are available, in this research considered as shell and tube heat exchanger. Overall Heat Transfer Coefficient (OHTC) informed that three major factors are influenced as passing of fluid (film) media coefficient inside the tubes, circulating of fluid (film) media coefficient over

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Taslim, M. E., and C. M. Wadsworth. "An Experimental Investigation of the Rib Surface-Averaged Heat Transfer Coefficient in a Rib-Roughened Square Passage." Journal of Turbomachinery 119, no. 2 (1997): 381–89. http://dx.doi.org/10.1115/1.2841122.

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Turbine blade cooling, a common practice in modern aircraft engines, is accomplished, among other methods, by passing the cooling air through an often serpentine passage in the core of the blade. Furthermore, to enhance the heat transfer coefficient, these passages are roughened with rib-shaped turbulence promoters (turbulators). Considerable data are available on the heat transfer coefficient on the passage surface between the ribs. However, the heat transfer coefficients on the surface of the ribs themselves have not been investigated to the same extent. In small aircraft engines with small

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Popa, Maria. "DETERMINING THE PERFORMANCE OF A HEAT EXCHANGER USED IN THE FOOD INDUSTRY." Romanian Journal of Petroleum & Gas Technology 5 (76), no. 1 (2024): 111–18. http://dx.doi.org/10.51865/jpgt.2024.01.08.

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The study of heat transfer in the food industry is as important as in any other industry. Food products are constantly subjected to heat treatments. For this reason, a sunflower food oil, which undergoes heat treatment in the manufacturing process, was chosen for this study. The study was carried out on a laboratory plant and aimed to determine the heat transfer coefficients for three sets of determinations: partial heat transfer coefficient inside - where the warm sunflower oil circulates, partial heat transfer coefficient in the annular space - where cold water circulates and overall heat tr

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Šál, Jiří, Daniela Štroufová, and Petra Bednářová. "Point thermal bridges of insulated pitched roof structures." MATEC Web of Conferences 146 (2018): 03014. http://dx.doi.org/10.1051/matecconf/201814603014.

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The current demands on building insulation are continuously increasing. It is understood that the lower the heat transfer coefficient of a particular part of a construction is, the greater the importance of systemic thermal bridges. This article compares the individual systems of insulation of pitched roofs in terms of the heat transfer coefficient. The focus is on the size of the point thermal bridges in rafter thermal insulation systems and determines their impact on increasing the overall heat transfer coefficient. However, it should be noted that point thermal bridges are individually very

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Srinivasan, Periasamy, and Nesakumar Dharmakkan. "Experimental studies in plate heat exchanger using therminol-55/Al2O3 & glycerol/Al2O3 nanofluids." Chemical Industry and Chemical Engineering Quarterly, no. 00 (2024): 35. http://dx.doi.org/10.2298/ciceq240903035s.

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The experiment aimed to compare the heat transfer performance of two base fluids, Therminol-55 and Glycerol, both mixed with aluminium oxide nanoparticle. The investigation focused on assessing how the addition of aluminium oxide nanoparticles (at concentrations of 0.1%, 0.2%, and 0.25% by volume) affected heat transfer in a plate heat exchanger using a mixture of Therminol-55/water and Glycerol/water. Results demonstrated a significant enhancement in heat transfer efficiency for both hot and cold sides of the exchanger when using these nanoparticle-infused base fluid mixtures. Specifically, t

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Piasecka, Magdalena, Beata Maciejewska, and Paweł Łabędzki. "Development of FEM Calculation Methods to Analyse Subcooled Boiling Heat Transfer in Minichannels Based on Experimental Results." Applied Sciences 12, no. 24 (2022): 12982. http://dx.doi.org/10.3390/app122412982.

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Even though two-phase heat transfer of refrigerants in minichannel heat sinks has been studied extensively, there is still a demand for improvements in overall thermal performance of miniature heat transfer exchangers. Experimental investigation and sophisticated heat transfer calculations with respect to heat transfer devices are still needed. In this work, a time-dependent experimental study of subcooled boiling was carried out for FC-72 flow in a heat sink, comprising of five asymmetrically heated minichannels. The heater surface temperature was continuously monitored by an infrared camera.

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Kumada, T. "Proposed Method for Measuring Local Heat Transfer Coefficients of Isothermal Surfaces." Journal of Heat Transfer 111, no. 4 (1989): 858–63. http://dx.doi.org/10.1115/1.3250797.

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A method has been proposed for measuring local heat transfer coefficients. The method uses the change of a wet surface temperature by radiation heating and can be applied to isothermal conditions and with large variations of the local heat transfer coefficients along the surface of a body. The present method is based on the heat balance equation, which expresses a simple relationship between humidity and wet-bulb temperatures. An experiment was devised to measure the local heat transfer coefficient along a flat plate. The results confirmed the effectiveness of the present method to measure loc

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Pérez Sánchez, Amaury, Maria Isabel La Rosa Veliz, Zamira María Sarduy Rodríguez, Elizabeth Ranero González, and Eddy Javier Pérez Sánchez. "Thermo-hydraulic design of a horizontal shell and tube heat exchanger for ethanol condensation." Nexo Revista Científica 36, no. 04 (2023): 551–71. http://dx.doi.org/10.5377/nexo.v36i04.16770.

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Horizontal shell and tube condensers are widely used in several industrial applications due to its versatility and heat transfer efficacy. In the present work, the thermo-hydraulic design of a horizontal shell and tube heat exchanger intended to condense 25,000 kg/h of a pure ethanol stream was carried out. Several key design parameters were calculated such as the number of tubes, heat transfer area, overall heat transfer coefficient, shell internal diameter, baffle spacing, as well as the pressure drop for both streams. The heat exchanger type is of pull-through floating head, and will presen

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Jamiru, Tamba, Oludaisi Adekomaya, Rotimi Sadiku, and Zhongie Huan. "Analysis of Overall Heat Transfer Coefficient of Composite Panels for Thermal Insulation." Applied Mechanics and Materials 864 (April 2017): 179–83. http://dx.doi.org/10.4028/www.scientific.net/amm.864.179.

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Heat infiltration through the external wall of refrigerated vehicles has been a concern to food industries considering high thermal load required to sustain unbroken cold chain. In this research, experiments were carried out with known fibres contents laid out at various orientations and the effect on the heat transfer measured. The results indicate that the estimated overall heat transfer coefficient of the composite reinforced with 10%wt. of fibre at 0o orientation (G10E) offers the lowest U value of 0.386950 W/m2K and 0.196680 W/m2K for 50 mm and 100 mm insulation thicknesses respectively.

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Azad, Gm S., Je-Chin Han, and Robert J. Boyle. "Heat Transfer and Flow on the Squealer Tip of a Gas Turbine Blade." Journal of Turbomachinery 122, no. 4 (2000): 725–32. http://dx.doi.org/10.1115/1.1311284.

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Experimental investigations are performed to measure the detailed heat transfer coefficient and static pressure distributions on the squealer tip of a gas turbine blade in a five-bladed stationary linear cascade. The blade is a two-dimensional model of a modern first-stage gas turbine rotor blade with a blade tip profile of a GE-E3 aircraft gas turbine engine rotor blade. A squealer (recessed) tip with a 3.77 percent recess is considered here. The data on the squealer tip are also compared with a flat tip case. All measurements are made at three different tip gap clearances of about 1, 1.5, an

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Ökten, Korhan, and Atilla Biyikoglu. "EFFECT OF AIR BUBBLE INJECTION ON THE OVERALL HEAT TRANSFER COEFFICIENT." Journal of Enhanced Heat Transfer 25, no. 3 (2018): 195–210. http://dx.doi.org/10.1615/jenhheattransf.2018025155.

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Iijima, Naoki, Daiki Satou, and Shigeo Masukawa. "Theoretical Calculation of Overall Heat Transfer Coefficient for Liquid Immersion Cooling." Journal of the Japan Institute of Power Electronics 49 (2023): 115–22. http://dx.doi.org/10.5416/jipe.49.115.

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Nhuchhen, Daya Ram, Prabir Basu, and Bishnu Acharya. "Investigation into overall heat transfer coefficient in indirectly heated rotary torrefier." International Journal of Heat and Mass Transfer 102 (November 2016): 64–76. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.06.011.

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Taborek, Jerry. "3.2.3 OVERALL HEAT TRANSFER COEFFICIENT, SURFACE TEMPERATURE AND MEAN TEMPERATURE DIFFERENCE." Heat Exchanger Design Updates 11, no. 4 (2004): 4. http://dx.doi.org/10.1615/heatexchdesignupd.v11.i4.40.

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Wirtz, R. A., and Ashok Mathur. "Convective Heat Transfer Distribution on the Surface of an Electronic Package." Journal of Electronic Packaging 116, no. 1 (1994): 49–54. http://dx.doi.org/10.1115/1.2905493.

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Measurements of the distribution of convective heat transfer over the five exposed faces of a low profile electronic package are described. The package, of square planform and length-to-height ratio, L/a = 6, is part of a regular array of such elements attached to one wall of a low aspect ratio channel. The coolant is air, and experiments are described for the Reynolds number range, 3000<Re<7000. The average heat transfer coefficient for the top face is found to be nearly equal to the overall average heat transfer coefficient for the element. The average heat transfer coefficient for the

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Mahrooghi, Ali, and Mohammad Moghiman. "Effect of nanoparticles on heat transfer in heat exchangers." Ciência e Natura 37 (December 21, 2015): 199. http://dx.doi.org/10.5902/2179460x20848.

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In this paper, forced convection flow and heat transfer of a Al2O3/Water nanofluid have beeninvestigated numerically by single and two phase (volume of fluid) models. Nanofluid flows inside the innertube of the isothermally concentric circular and sinusoidal double tube heat exchangers while hot pure waterflows in the outer tube. The single-phase and two-phase models is used to simulate the nanofluid forcedconvection of 2% and 3% volume concentrations. The renormalization group k-ε model is used to simulateturbulence in ANSYS FLUENT 15.0. Results show that the overall heat transfer coefficient

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