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Journal articles on the topic 'Total heat transfer rate'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Wong, King Leung, Wen Lih Chen, and Li Wen Po. "Reliable Method of a Non-Insulated Double-Pipe Heat Exchanger." Applied Mechanics and Materials 284-287 (January 2013): 908–14. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.908.

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Log mean temperature difference (LMTD) method neglecting the influence of heat radiation is conventionally used to calculate the total heat transfer rate of heat exchangers. From recent investigation of a single-pipe heat exchanger in some practical situations, it is found that the total heat transfer rate error of single-pipe heat exchanger obtained by LMTD method is up to 40% in the situation of oxidized metal heat exchanger with higher surface emissivity located in ambient air with low heat convection coefficient. A log mean heat transfer rate (LMHTR) method considering heat radiation has b

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2

Kunar, Rahul, and Dr Sukul Lomash. "Enhancement of Temperature Distribution and Heat Transfer Coefficient of Ribbed Tube by Simulation." SMART MOVES JOURNAL IJOSCIENCE 7, no. 1 (2021): 21–28. http://dx.doi.org/10.24113/ijoscience.v7i1.344.

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The heat transfer from surface may in general be enhanced by increasing the heat transfer coefficient between a surface and its surrounding or by increasing heat transfer area of the surface or by both. The main objective of the study and calculate the total heat transfer coefficient. Improve the heat transfer rate by using ANSYS CFD. During the CFD calculations of the flow in internally ribbed tubes. And calculated the temperature distribution and pressure inside the tube by using ansys. The model was created using CatiaV5 and meshed with Ansys, and the flow analysis is done with Ansys 19.2.

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3

Adegbola, A. A., A. D. Ogunsola, O. O. Oladoja, A. A. Aderibigbe, and M. O. Adetunji. "Material and Parametric Design Optimization of Improved Heat Transfer Rate of AC Condenser." Journal of Energy Research and Reviews 16, no. 10 (2024): 1–13. http://dx.doi.org/10.9734/jenrr/2024/v16i10373.

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Air conditioner system is made up of a condenser that removes unwanted heat in an enclosure through the refrigerant and transfers the heat outside. Improving the heat transfer of air conditioning condenser is still a difficult task because of the broader set of materials and various parametric designs involved. Due to this high cost, the experimental set-up cost cannot be modified, instead, simulation analysis was introduced in the optimization process in order to achieve a near-optimal solution. The aim of this research is to improve the heat transfer rate for air conditioning condenser by ma

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4

Cui, Weiwei, Zongming Li, Xiaorong Xiang, Guoli Pang, and Laishun Yang. "Sensitivities of Geometric Parameters and Inlet Conditions on the Flow-Heat Characteristics of the Precooler in SABRE." Energies 17, no. 23 (2024): 5890. http://dx.doi.org/10.3390/en17235890.

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A physical model for the precooler in a SABRE engine was established, and both the influencing degrees and physical mechanisms of inlet conditions and geometric parameters on the flow-heat transfer characteristics of the precooler unit were explored through parametric analysis and sensitivity analysis, respectively. The results demonstrated that the air massflow rate exerted the greatest influence on the total pressure loss coefficient of the precooler unit due to its significant impact on airflow velocity and thermal loading. The inlet total temperature had a dominant effect on heat transfer

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5

Yin, Shaowu, Feiyang Xue, Xu Wang, Lige Tong, Li Wang, and Yulong Ding. "Heat Transfer Characteristics of High-Temperature Dusty Flue Gas from Industrial Furnaces in a Granular Bed with Buried Tubes." Energies 13, no. 14 (2020): 3589. http://dx.doi.org/10.3390/en13143589.

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Experimental heat transfer equipment with a buried tube granular bed was set up for waste heat recovery of flue gas. The effects of flue gas inlet temperature (1096.65–1286.45 K) and cooling water flow rate (2.6–5.1 m3/h) were studied through experiment and computational fluid dynamics’ (CFD) method. On the basis of logarithmic mean temperature difference method, the total heat transfer coefficient of the granular bed was used to characterize its heat transfer performance. Experimental results showed that the waste heat recovery rate of the equipment exceeded 72%. An increase in the cooling wa

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6

Zou, Hang, Peng Pei, Chen Wang, and Dingyi Hao. "A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps." PLOS ONE 16, no. 5 (2021): e0250583. http://dx.doi.org/10.1371/journal.pone.0250583.

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Horizontal ground heat exchangers (HGHEs) have advantages such as convenient construction and low cost; however, their application and popularization are restricted owing to traditional linear HGHEs occupying large space and presenting low total heat transfer capacity. Spiral-coil and slinky-coil HGHEs have been proposed, but currently a comprehensive comparison and evaluation for these types of HGHEs are still needed. In this study, a three-dimensional heat transfer model of the three types of HGHEs for ground source heat pumps (GSHPs) was established. Based on the simulation results, the lon

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7

Shrivastava, Devashish, Benjamin McKay, and Robert B. Roemer. "An Analytical Study of Heat Transfer in Finite Tissue With Two Blood Vessels and Uniform Dirichlet Boundary Conditions." Journal of Heat Transfer 127, no. 2 (2005): 179–88. http://dx.doi.org/10.1115/1.1842788.

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Counter-current (vessel–vessel) heat transfer has been postulated as one of the most important heat transfer mechanisms in living systems. Surprisingly, however, the accurate quantification of the vessel–vessel, and vessel–tissue, heat transfer rates has never been performed in the most general and important case of a finite, unheated/heated tissue domain with noninsulated boundary conditions. To quantify these heat transfer rates, an exact analytical expression for the temperature field is derived by solving the 2-D Poisson equation with uniform Dirichlet boundary conditions. The new results

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8

Mu, Lin, and Hong Chao Yin. "Numerical Simulation of the Influence of Deposits on Heat Transfer Process in a Heat Recovery Steam Generator." Applied Mechanics and Materials 121-126 (October 2011): 1301–5. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.1301.

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Flue gas entrains a large number of ash particles which are composed of alkali substances into the heat recovery steam generator (HRSG). The deposition of particles on the tube surface of heat transfer can reduce the heat transfer efficiency significantly. In the present work, an Eulerian- Lagrangian model based on Computational Fluid Dynamics (CFD) is implemented to simulation flue gas turbulent flow, heat transfer and the particle transport in the HRSG. Several User-Defined Functions (UDFs) are developed to predict the particle deposition/ rebounding as well as the influence of physical prop

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9

Fu, Wen, Li Zhang, Xiaowei Li, and Xinxin Wu. "Numerical Investigation of Natural Convective Condensation with Noncondensable Gases in the Reactor Containment after Severe Accidents." Science and Technology of Nuclear Installations 2019 (March 3, 2019): 1–12. http://dx.doi.org/10.1155/2019/1673834.

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The heat and mass transfer processes of natural convective condensation with noncondensable gases are very important for the passive containment cooling system of water cooled reactors. Numerical simulation of natural convective condensation with noncondensable gases was realized in the Fluent software by adding condensation models. The scaled AP600 containment condensation experiment was simulated to verify the numerical method. It was shown that the developed method can predict natural convective condensation with noncondensable gases well. The velocity, species, and density fields in the sc

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10

Rajeh, Taha, Ping Tu, Hua Lin, and Houlei Zhang. "Thermo-Fluid Characteristics of High Temperature Molten Salt Flowing in Single-Leaf Type Hollow Paddles." Entropy 20, no. 8 (2018): 581. http://dx.doi.org/10.3390/e20080581.

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A single-leaf type paddle heat exchanger with molten salt as the working fluid is a proper option in high temperature heating processes of materials. In this paper, based on computational fluid dynamics (CFD) simulations, we present the thermo-fluid characteristics of high temperature molten salt flowing in single-leaf type hollow paddles in the view of both the first law and the second law of thermodynamics. The results show that the heat transfer rate of the hollow paddles is significantly greater than that of solid paddles. The penalty of the heat transfer enhancement is additional pressure

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11

Miura, K., A. Nagao, and K. Ueyama. "Heat Emission from a Burning Cigarette." Beiträge zur Tabakforschung International/Contributions to Tobacco Research 19, no. 5 (2001): 245–49. http://dx.doi.org/10.2478/cttr-2013-0711.

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AbstractWe investigated the relationship between the smoldering burn rate and the heat transfer from a burning cigarette by measuring the heat emitted by radiation and convection, separately. The net heat generated and the net heat emitted by a burning cigarette did not vary with a change of the cigarette smoldering burn rate. The total heat emitted from a statically burning cigarette was about 50% of the total combustion heat. About 50% of the heat emitted was released as radiation heat. The smoldering burn rate did not affect the total amount of heat emitted nor the ratio of radiated heat to

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12

Sarafraz, M. M., M. S. Shadloo, Zhe Tian, et al. "Convective Bubbly Flow of Water in an Annular Pipe: Role of Total Dissolved Solids on Heat Transfer Characteristics and Bubble Formation." Water 11, no. 8 (2019): 1566. http://dx.doi.org/10.3390/w11081566.

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Formation of bubbles in water inside an annulus pipe in a flow boiling regime was experimentally investigated. The effect of various variables, such as total dissolved solid materials (TDS) in terms of mass fraction, flow rate of water, and applied heat flux (HF) on the heat transfer coefficient (HTC) and bubble behavior of water, was experimentally investigated. A regression formula was fitted to estimate the average bubble diameter at various TDS values, with accuracy of <4.1% up to heat flux of 90 kW/m2. Results show that the presence of TDS materials can increase the contact angle of bu

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13

Qin, Hongwei, Ruirong Dang, and Bo Dang. "Research on oil-water mixed-phase flow measurement method based on heat transfer method." Insight - Non-Destructive Testing and Condition Monitoring 66, no. 11 (2024): 667–75. http://dx.doi.org/10.1784/insi.2024.66.11.667.

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Oil-water two-phase flow at oilfield wellheads is a common occurrence in distribution. This paper proposes using a heat transfer method to accurately measure and monitor the total fluid volume at the wellhead. To achieve this, thermal sensors of types PT1000 and PT20, which are suitable for measuring oil-water mixed flow, are first designed. The feasibility and linearity of the sensors are simulated and calculated. Secondly, the heat transfer coefficient is computed using experimental methods and a functional relationship between the heat transfer coefficient and the flow rate is derived. Fina

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14

Guo, Lei, Shusheng Zhang, and Jing Hu. "Flow boiling heat transfer characteristics of two-phase flow in microchannels." AIP Advances 12, no. 5 (2022): 055219. http://dx.doi.org/10.1063/5.0095786.

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A set of experimental platforms with widths of 0.5, 1.0, 1.5, and 2.0 mm was established to explore the mechanism of flow boiling bubble dynamics in microchannels, focusing on heat transfer characteristics, pressure loss, and two-phase flow pattern identification. Bubble flow, restricted bubble flow, and dry area were observed in all four channels. The appearance of flow pattern was related to flow rate and channel width. Under the condition of the same channel width, the initial heat flux of subcooled boiling gradually increased with increase in flow rate, and this change trend was close to t

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15

Ahmadi, Mehdi. "NATURAL CONVECTIVE HEAT TRANSFER IN A POROUS MEDIUM WITHIN A TWO DIMENSIONAL ENCLOSURE." IIUM Engineering Journal 18, no. 2 (2017): 196–211. http://dx.doi.org/10.31436/iiumej.v18i2.593.

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In this paper, to achievement the effect of increase number of heating components arrangement on the rate of heat transfer of natural convection, that others have been less noticed. Therefore, in each stage increase the number of heating components so much the space occupied by them remains constant. Then by calculating the amount of heat transfer in different Rayleigh number became clear that minify and distributing heating solid phase in the enclosure increases the total Nusselt number and heat transfer, One reason could be high intensity of fluid motion in corners and near walls of the encl

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16

Chen, Shengpeng, Xiaohui Ma, and Chaoling Han. "Experimental Study on Heat Transfer Characteristics of Radiant Cooling and Heating." Energies 17, no. 13 (2024): 3304. http://dx.doi.org/10.3390/en17133304.

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While traditional air conditioning systems serve their purpose, radiation air conditioning systems provide several benefits, including improved comfort, higher energy efficiency, and lower initial costs. Nevertheless, the heat exchange capacity per unit area of the radiation plate in such systems is somewhat restricted, which directly affects their practical engineering applications. To address this, experimental investigations were undertaken to examine the impact of cold/hot water supply temperature, water flow velocity, and surface emissivity of radiant panels on their heat transfer charact

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17

Mehar, Swarnik, and Pankaj Mishra. "“A REVIEW OF HEAT DISSIPATION ANALYSIS BY VARYING GEOMETRICAL CONDITION OF CYLINDRICAL FIN”." IJOSTHE 5, no. 4 (2018): 7. http://dx.doi.org/10.24113/ojssports.v5i4.71.

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If the heat in the heat engine is not removed properly, it causes the development of the detonation and eventually reduces the efficiency of the engine, so that the heat dissipation rate of the cylinder an important and interesting task is the option. The cylinder of the engine is one of the most important automotive components, variations of high temperature and thermal loads. To cool the cylinder, the ribs are provided on the surface of the cylinder, to increase the rate of heat transfer. By a thermal analysis of the motor cylinder and the ribs that surround it, it is useful to know the heat

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18

Rahimi, Alireza, Pouria Azarikhah, Abbas Kasaeipoor, Emad Hasani Malekshah, and Lioua Kolsi. "Lattice Boltzmann simulation of free convection’s hydrothermal aspects in a finned/multi-pipe cavity filled with CuO-water nanofluid." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 3 (2019): 1058–78. http://dx.doi.org/10.1108/hff-07-2018-0349.

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Purpose This paper aims to investigate the natural convection fluid flow and heat transfer in a finned/multi-pipe cavity. Design/methodology/approach The cavity is filled with the CuO-water nanofluid. The Koo–Kleinstreuer–Li model is used to estimate the dynamic viscosity and consider Brownian motion. On the other hand, the effect of the shapes of nanoparticles on the thermal conductivity and related heat transfer rate is presented. Findings In the present investigation, the governing parameters are Rayleigh number, CuO nanoparticle concentration in pure water and the thermal arrangements of i

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19

Huang, Yue Wu, and De Xing Sun. "Optimum Performance Characteristics of an Irreversible Four-Temperature-Level Absorption Refrigerator." Applied Mechanics and Materials 90-93 (September 2011): 3051–56. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.3051.

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The optimal performance of an absorption refrigerator operating between four temperature levels with the losses of heat resistance and internal irreversibility is analyzed first by taking the total heat transfer area of heat exchangers as an objective function. The minimum total heat transfer area is described in terms of the rate of the entropy changes of four heat reservoirs, and the generally optimal relation among the cooling load, the coefficient of performance and total heat transfer area is achieved. Then, an ecological optimization criterion is proposed for the best mode of operation o

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20

Chai, Mu, Jiahui Tan, Lingwei Gao, et al. "Effects of Different Heat Transfer Conditions on the Hydrogen Desorption Performance of a Metal Hydride Hydrogen Storage Tank." Energies 15, no. 22 (2022): 8375. http://dx.doi.org/10.3390/en15228375.

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To investigate the influence of thermal effects on the hydrogen desorption performance of the metal hydride hydrogen storage system, a two-dimensional numerical model was established based on a small metal hydride hydrogen storage tank, and its accuracy was verified by the temperature variations in the reaction zone of the hydrogen storage tank during hydrogen desorption. In addition, the influence of the heat transfer medium on the heat and mass transfer performance of the hydrogen desorption reaction was analyzed. An external heat transfer bath was added to simulate the thermal effect of the

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21

Mishra, Subhash, Sanjeev Varshney, Anil P. Singh, and Pradeep Barnwal. "Parametric Analysis of Shell and Tube Heat Exchanger." International Journal of Advance Research and Innovation 9, no. 4 (2021): 90–95. http://dx.doi.org/10.51976/ijari.942112.

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The present work investigated the effect of mass flow rate, hot and cold fluid temperature on total heat transfer and effectiveness for shell and tube heat exchanger. In addition, the effect of Reynolds number and type of fluid on heat transfer coefficient and effectiveness was studied. Increasing Reynolds number by 500 from 7000, 8% increasing in heat transfer coefficient has been observed. While 7% increase in Reynolds number, effectiveness has been increases by 5%. Nusselt number change shows higher effect on effectiveness for shell side as compared to tube side. A MATLAB program has been f

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22

Gao, Xuefeng, Yanjun Zhang, Zhongjun Hu, and Yibin Huang. "Numerical Investigation on the Influence of Surface Flow Direction on the Heat Transfer Characteristics in a Granite Single Fracture." Applied Sciences 11, no. 2 (2021): 751. http://dx.doi.org/10.3390/app11020751.

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As fluid passes through the fracture of an enhanced geothermal system, the flow direction exhibits distinct angular relationships with the geometric profile of the rough fracture. This will inevitably affect the heat transfer characteristics in the fracture. Therefore, we established a hydro-thermal coupling model to study the influence of the fluid flow direction on the heat transfer characteristics of granite single fractures and the accuracy of the numerical model was verified by experiments. Results demonstrate a strong correlation between the distribution of the local heat transfer coeffi

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23

Bejan, A. "Theory of Heat Transfer From a Surface Covered With Hair." Journal of Heat Transfer 112, no. 3 (1990): 662–67. http://dx.doi.org/10.1115/1.2910438.

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This paper describes the fundamental mechanisms of heat transfer through a surface covered with perpendicular hair strands of uniform density. An air flow parallel to the skin seeps through the spaces created between the hair strands. It is shown that the total heat transfer rate from the surface is due to two contributions: (i) the heat conducted through the hair strands, which act as fins, and (ii) the heat convected from the bare portions of the skin. When the air flow is slow enough to conform to the Darcy regime, there exists an optimum hair strand diameter for which the total heat transf

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24

Ben-Mansour, R., and L. Al-Hadhrami. "Effect of Reynolds Number and Property Variation on Fluid Flow and Heat Transfer in the Entrance Region of a Turbine Blade Internal-Cooling Channel." International Journal of Rotating Machinery 2005, no. 1 (2005): 36–44. http://dx.doi.org/10.1155/ijrm.2005.36.

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Internal cooling is one of the effective techniques to cool turbine blades from inside. This internal cooling is achieved by pumping a relatively cold fluid through the internal-cooling channels. These channels are fed through short channels placed at the root of the turbine blade, usually called entrance region channels. The entrance region at the root of the turbine blade usually has a different geometry than the internal-cooling channel of the blade. This study investigates numerically the fluid flow and heat transfer in one-pass smooth isothermally heated channel using the RNGk−εmodel. The

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25

Rahimi Esboee, Mazaher, Esmaeil Abokazempour, Abbas Ramiar, Amir Arya, Ali Akbar Ranjbar, and Majid Rahgoshay. "Flow and Heat Transfer Investigation of Forced Convection of Nanofluid in a Wavy Channel at Different Wavelengths and Phase Difference." Boletim da Sociedade Paranaense de Matemática 36, no. 2 (2018): 137. http://dx.doi.org/10.5269/bspm.v36i2.30905.

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Changing the fluid properties and flow geometry are two common ways of making an improvement in heat transfer rate. Recent investigations on nanofluid, as such suspensions are often called, indicate that the suspended nanoparticles remarkably change the transport properties and heat transfer characteristics of the suspension. Bending walls can also improve heat transfer by increasing the total heat transfer surface and changing the behavior of the flow. In this work a two dimensional incompressible laminar nanofluid flow in a wavy channel with sinusoidal curved walls is numerically investigate

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26

Wu, H. L., Y. Gong, and X. Zhu. "Air Flow and Heat Transfer in Louver-Fin Round-Tube Heat Exchangers." Journal of Heat Transfer 129, no. 2 (2006): 200–210. http://dx.doi.org/10.1115/1.2402180.

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Experimental investigations were conducted to understand the air flow and heat transfer in louver-fin round-tube two-row two-pass cross-counterflow heat exchangers. The Colburn factor j and friction factor f were obtained by using the ε-NTU approach. A three-dimensional computational fluid dynamics model was developed based on a representative unit cell with periodical and symmetric boundary conditions. Analysis of tube-side circuiting effect has been conducted and showed improvement by applying overall nonlinear tube-side fluid temperature boundary conditions. Comparison of heat transfer rate

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27

Du, Juan, and Jun Deng. "Heat transfer enhancement using non-equally structure in a plate-fin heat exchanger with offset fins." Thermal Science, no. 00 (2022): 36. http://dx.doi.org/10.2298/tsci211227036d.

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In this study, a cross flow plate-fin heat exchanger with offset fins is optimized by considering the effects of flow maldistribution for air side. For this purpose, the study is focused on an increase in the rate of heat transfer, which can be achieved by using non-equally fin structure. Numerical simulations have been carried out to investigate the thermodynamic characteristics of the non-equally full-size PFHE by using the porous media approach. Based on the numerical model, flow distribution, total heat rate and pressure drop of the PFHE are studied. A asymmetric structure with heat transf

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Xi, Kun, Zhihui Xie, Xiang Zhao, Yu Song, and Hanyu Liu. "Fast Calculation of Supercritical Carbon Dioxide Flow, Heat Transfer Performance, and Mass Flow Rate Matching Optimization of Printed Circuit Heat Exchangers Used as Recuperators." Mathematics 11, no. 20 (2023): 4241. http://dx.doi.org/10.3390/math11204241.

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Printed circuit heat exchangers (PCHEs) are widely used as recuperators in the supercritical carbon dioxide (S-CO2) Brayton cycle design. The variation of heat sources will have a great impact on the heat transfer effect of the recuperator. It is of interest to study the fast calculation of flow and heat transfer performance of PCHEs under different operating conditions to obtain the optimal comprehensive performance and provide guidance for the operation control strategy analysis. Herein, a fast calculation method is established through a one-dimensional model of a PCHE based on Modelica. The

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Feng, Huijun, Wei Tang, Lingen Chen, Junchao Shi, and Zhixiang Wu. "Multi-Objective Constructal Optimization for Marine Condensers." Energies 14, no. 17 (2021): 5545. http://dx.doi.org/10.3390/en14175545.

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A marine condenser with exhausted steam as the working fluid is researched in this paper. Constructal designs of the condenser are numerically conducted based on single and multi-objective optimizations, respectively. In the single objective optimization, there is an optimal dimensionless tube diameter leading to the minimum total pumping power required by the condenser. After constructal optimization, the total pumping power is decreased by 42.3%. In addition, with the increase in mass flow rate of the steam and heat transfer area and the decrease in total heat transfer rate, the minimum tota

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Yan, Qun, Peng Sun, Qinqin Mu, and Yonghui Chen. "Quantifying the heat transfer effect of the axial turbine stator well cavity." Thermal Science, no. 00 (2024): 158. http://dx.doi.org/10.2298/tsci230123158y.

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A Thermal-Fluid-Structural model is presented for quantifying the heat generation by the labyrinth seal in the low-pressure turbine stator well cavity. The method combines windage heating and convective heat transfer effects for labyrinth seal design, making it possible to use the heat transfer boundary condition instead of adiabatic to do the computational fluid dynamic calculation. The solutions illustrate how the outlet total temperature may change depending on the seal pressure ratios, windage heating, and heat transfer coefficient. It is further demonstrated that with a fixed seal pressur

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Zhou, Yuheng, Zhouhang Li, and Yuling Zhai. "Thermal–Hydraulic Performance Comparison of Printed Circuit Heat Exchangers with Identical-Size and Hybrid-Size Unit Channels." Energies 18, no. 8 (2025): 1947. https://doi.org/10.3390/en18081947.

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The supercritical carbon dioxide Brayton cycle has been identified as being applicable in a wide variety of applications, and printed circuit heat exchangers (PCHEs) are widely used in these applications due to their good compactness and high thermal efficiency. A PCHE with hybrid-size unit channels has been proposed and found capable of improving the heat transfer performance, but most results were obtained at non-consistent total volume and mass flow rate. Therefore, given the space constraints of heat exchangers in supercritical CO2 Brayton cycles, this study investigates the application of

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Rosario, L., and M. M. Rahman. "Overall Efficiency of a Radial Fin Assembly Under Dehumidifying Conditions." Journal of Energy Resources Technology 120, no. 4 (1998): 299–304. http://dx.doi.org/10.1115/1.2795051.

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The aim of this paper is the analysis of heat transfer in a radial fin assembly during the process of dehumidification. An individual finned tube geometry is a reasonable representation of heat exchangers used in air conditioning. The condensation process involves both heat and mass transfer and the cooling takes place by the removal of sensible as well as latent heat. The ratio of sensible to total heat is an important quantity that defines the heat transfer process during a dehumidifier operation. A one-dimensional model for heat transfer in the fin and the heat exchanger block is developed

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Pise, A. T., A. V. Waghmare, and V. G. Talandage. "Heat Transfer Enhancement by Using Nanomaterial in Phase Change Material for Latent Heat Thermal Energy Storage System." Asian Journal of Engineering and Applied Technology 2, no. 2 (2013): 52–57. http://dx.doi.org/10.51983/ajeat-2013.2.2.667.

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Latent heat energy storage systems using paraffin wax could have lower heat transfer rates during melting / freezing processes due to its inherent low thermal conductivity. The thermal conductivity of paraffin wax can be enhanced by employing high conductivity materials such as alumina (Al2O3) nanopowder. In this paper the experimental investigation has been carried out to study the performance enhancement of paraffin wax with nanoalumina (Al2O3) particles in mass fraction of 1, 3, and 5% in a Latent Heat Thermal Energy Storage (LHTES) System at constant flow rate and variable temperature of h

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Alif Gita Arumsari and Petrus Junake Ginting. "Analysis of Heat Transfer Coefficient of Shell and Tube on Heat Exchanger Using Heat Transfer Research Inch (HTRI) Software." Formosa Journal of Sustainable Research 2, no. 5 (2023): 1175–84. http://dx.doi.org/10.55927/fjsr.v2i5.4271.

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The heat transfer process in the industrial world is the most important thing to pay attention to, especially in industrial equipment that works at high temperatures, one of the heat exchangers commonly used in the industrial world is a heat exchanger which is used to exchange heat between fluids of different temperatures. Therefore, it is necessary to pay attention to the performance of the heat exchanger. In the shell and tube type heat exchanger, apart from using baffles which aim to direct the flow on the shell side, it also aims to increase the rate of heat transfer that occurs between th

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Sabariesan., K., Mohammed. H. Adil, R. Madhavan., A. Nishanth., and H. Shafiq. "Design and Analysis of Four Stroke Engine Fins and compared with Modified Design." International Journal of Multidisciplinary Research Transactions 5, no. 6 (2023): 56–68. https://doi.org/10.5281/zenodo.7882967.

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The Engine cylinder is the heart of the automobile components, which is subjected to high temperature variations and thermal stresses. In order to cool the cylinder, fins are provided on the surface of the cylinder to increase the rate of Heat transfer. By executing the thermal analysis of the engine fins, it is helpful to know the heat dissipation rate and temperature distribution inside the cylinder. The main aim of the present project is to analyze the thermal properties like Directional Heat Flux, Total Heat Flux and Temperature Distribution of a modified conical design along with the exis

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KAYA, Murat, and Şükrü KAYA. "Optimum fin spacing of rectangular fins on aluminum heat sinks plates." Proceedings of the Romanian Academy, Series A: Mathematics, Physics, Technical Sciences, Information Science 24, no. 2 (2023): 151–57. http://dx.doi.org/10.59277/pra-ser.a.24.2.07.

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Aluminum heat sink cooling fin which are especially used for cooling electronic circuits, are directly related to their heat transfer capability and design. In heat transfer, the most important factors are the surface area where the heat is taken, the fin length, the distance between the fins, the airflow rate, and the thermal conductivity. In this study, the effects of the width between the fins on the heat transfer were investigated. In the study, the dimensions of the rectangular finned cooling plate were 200 mm in width, 200 mm in length, 25 mm in fin height, fin spacing between 4 and 2.5

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Pourmahmoud, Nader, Hosseinali Soltanipour, and Iraj Mirzaee. "The effects of longitudinal ribs on entropy generation for laminar forced convection in a microchannel." Thermal Science 20, no. 6 (2016): 1963–72. http://dx.doi.org/10.2298/tsci130920110s.

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This paper deals with fluid flow, heat transfer and entropy generation in an internally ribbed microchannel. Mass, momentum and energy equations for constant heat flux boundary condition are solved using the finite volume method. Average Nusselt number and Fanning friction factor are reported as a function of rib height at different Reynolds numbers. The effects of non-dimensional rib height, wall heat flux and the Reynolds number on the entropy generation attributed to friction, heat transfer and total entropy generation are explored. The first law indicates that rib height has the great effe

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Chhokar, Callum, Milad Ebadi, and Majid Bahrami. "The total heat transfer rate in the evaporating thin film: A new analytical solution." International Communications in Heat and Mass Transfer 162 (March 2025): 108653. https://doi.org/10.1016/j.icheatmasstransfer.2025.108653.

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Shishatskii, Y. I., S. A. Nickel, S. A. Tolstov, I. A. Avcinov, A. A. Derkanosova, and A. E. Emelyanov. "Heat transfer mechanisms in cooling towers (theory and calculation methods)." Proceedings of the Voronezh State University of Engineering Technologies 86, no. 1 (2024): 31–37. https://doi.org/10.20914/2310-1202-2024-1-31-37.

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Cooling towers are high-intensity mixing heat exchangers. In them, heat exchange occurs at direct contact (contact) of heat carriers, i.e. in heat exchangers there is no thermal resistance of the wall. When circulating water is cooled by air, part of the heat is transferred due to surface evaporation of water - transformation of water into vapor with subsequent transfer of vapor by diffusion into the air stream. The other part is due to the temperature difference between water and air, i.e. heat transfer by contact (conduction and convection). Heat transfer by direct contact between air and in

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Harun, Zambri, Ng Jie Suang, W. M. Faizal W. Mahmood, Mahir Faris Abdullah, and Eslam Reda Lotfy. "Computational Fluid Dynamics Simulation on the Heat Sink Performance of a Graphics Processing Unit Thermal Management." Jurnal Kejuruteraan 31, no. 1 (2019): 139–47. http://dx.doi.org/10.17576/jkukm-2019-31(1)-17.

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The article focuses on the numerical investigation of temperature distribution in a central processing units (CPU) case with different time interval such as t = 100 s, 200 s, 300 s, 400 s, 500 s. Heat sink performance of a graphics processing unit (GPU) thermal management and impacts of different shape and velocity on the thermal performance are considered. In this study, three heat sink models are designed (A, B, and C) based on the volume area of heat sink. This study emphasizes the heat transfer phenomena caused by a GPU in a computer case in both steady state and transient state. A CFD sof

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Ningsih, Erlinda, Isa Albanna, Aita Pudji Witari, and Gistanya Lindar Anggraini. "PERFORMANCE SIMULATION ON THE SHELL AND TUBE OF HEAT EXCHANGER BY ASPEN HYSYS V.10." Jurnal Rekayasa Mesin 13, no. 3 (2022): 701–6. http://dx.doi.org/10.21776/jrm.v13i3.1078.

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Heat exchanger type shell and tube, which is the most commonly used heat exchanger in various industries. The efficiency of heat exchangers can be seen from their performance to affect its economy from a process. The purpose is to determine the influence of the hot fluid flow rate and the cold fluid on the overall heat transfer coefficient (U) and log mean temperature difference (ΔTLMTD) values. This simulation is done using Aspen HYSYS V.10 applications and obtained data of the total heat transfer coefficient (U) and ΔTLMTD values. The heat exchanger shell and tube used type 1-2 with single s

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Elakkiyadasan, R., Kumar P. Manoj, M. Subramanian, N. Balaji, M. Karthick, and S. Kaliappan. "Optimization of Shell and Tube Condenser for Low Temperature Thermal Desalination Plant." E3S Web of Conferences 309 (2021): 01011. http://dx.doi.org/10.1051/e3sconf/202130901011.

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In the current work, attempt for enhancing the heat exchanger of the shell and tube by analyzing the various parameters. The heat exchanger is a device used to transfer heat between at least two fluids. In the different kinds of heat exchangers utilized in various industries, shell and tube heat exchangers are presumably the most adaptable and widely heat exchangers utilized in most industrial areas. Based on the relationship between different parameters such as tube velocity, overall heat transfer coefficient, mass flow rate, and pumping power, analysis is carried out. Results show that the t

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Youcef, Ahmed, and Rachid Saim. "Effect of Spacing Between Baffles on the Dynamic and Thermal Behavior of Water in a Shell-and-Tube Heat Exchanger." Revue des Composites et des Matériaux Avancés 32, no. 3 (2022): 157–63. http://dx.doi.org/10.18280/rcma.320307.

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A numerical simulation of a turbulent flow of water in three shell and tube heat exchangers equipped with 6, 8, 10 segmental baffles as the working fluid at Reynolds numbers ranging from 24327, 33356, 42569 are performed. The conservation equations of mass, momentum and energy are solved by the finite volume method based on the SIMPLE algorithm for coupling velocity-pressure, the mathematical model k-ε within the Fluent software is used in the different cases presented. The temperature, the velocity, the friction factor, the heat transfer coefficient, the pressure drop in the shell, the total

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Bejan, Adrian. "The Equivalence of Maximum Power and Minimum Entropy Generation Rate in the Optimization of Power Plants." Journal of Energy Resources Technology 118, no. 2 (1996): 98–101. http://dx.doi.org/10.1115/1.2792711.

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It is shown that to maximize the power output of a power plant is equivalent to minimizing the total entropy generation rate associated with the power plant. This equivalence is illustrated by using two of the oldest and simplest models of power plants with heat transfer irreversibilities. To calculate the total entropy generation rate correctly, one must recognize that the optimization process (e.g., the variability of the heat input) requires “room to move,” i.e., an additional, usually overlooked, contribution to the total entropy generation rate.

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Ehsan Kianpour, Nor Azwadi Che Sidik, Seyyed Muhammad Hossein Razavi Dehkordi, and Siti Nurul Akmal Yusof. "Numerical Simulation of Steady and Unsteady Flow and Entropy Generation by Nanofluid Within a Sinusoidal Channel." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 89, no. 2 (2021): 25–42. http://dx.doi.org/10.37934/arfmts.89.2.2542.

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Heat transfer has always been one of the most important aspects of human life. So far, many sources have been reported on methods of increasing the heat transfer rate. Many of these methods focus on changes in equipment structure. These techniques can hardly cope with the growing demand for heat transfer and compression in equipment. Recent advances in nanoparticle production can be seen as a breakthrough in methods of increasing heat transfer. The purpose of this study is to numerically investigate the flow field and heat transfer of water-aluminium oxide nanofluid in a wavy channel. The chan

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Tarrad, Ali H. "3D Numerical Modeling to Evaluate the Thermal Performance of Single and Double U-tube Ground-coupled Heat Pump." HighTech and Innovation Journal 3, no. 2 (2022): 115–29. http://dx.doi.org/10.28991/hij-2022-03-02-01.

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The heat transfer rate and borehole design represent great challenges to the thermal equipment designer of the ground-coupled heat pump. The present model represents a mathematical and numerical technique implemented to tackle such a problem. A thermal assessment was established to estimate the total energy dissipated to the ground zone for a heat pump utilized for cooling purposes in the summer season. Comsol Multiphysics 5.4 software was used to build a 3-dimensional model to assess the thermal performance of single and double U-tube boreholes that circulate water as a thermal transfer mediu

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Saleem, M., M. A. Hossain, Suvash C. Saha, and Y. T. Gu. "Heat Transfer Analysis of Viscous Incompressible Fluid by Combined Natural Convection and Radiation in an Open Cavity." Mathematical Problems in Engineering 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/412480.

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The effect of radiation on natural convection of Newtonian fluid contained in an open cavity is investigated in this study. The governing partial differential equations are solved numerically using the Alternate Direct Implicit method together with the Successive Overrelaxation method. The study is focused on studying the flow pattern and the convective and radiative heat transfer rates are studied for different values of radiation parameters, namely, the optical thickness of the fluid, scattering albedo, and the Planck number. It was found that, in the optically thin limit, an increase in the

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Sarangi, Abhisek, Asish Sarangi, Sudhansu Sekhar Sahoo, Ramesh Kumar Mallik, and Mohamed M. Awad. "Conjugate Radiation and Convection Heat Transfer Analysis in Solar Cooker Cavity Using a Computational Approach." Energies 16, no. 9 (2023): 3868. http://dx.doi.org/10.3390/en16093868.

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The heat loss caused by radiation and persistently laminar natural convection in a solar cooker cavity that has a rectangular cavity or a trapezoidal cavity are computationally explored in this paper. The hot bottom and the adiabatic side wall are both taken into account. Two possibilities are considered for the top wall: first, a cold wall, and, second, losses from wind-induced convection and radiation. The parameters of heat loss in various depth cavities have been investigated along with a variety of external heat transfer coefficient values above the glass surface were simulated. The emiss

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Liu, Jia-Bao, Morteza Bayati, Mazhar Abbas, Alireza Rahimi, and Mohammad Naderi. "Mesoscopic approach for simulating nanofluid flow and heat transfer in a finned multi-pipe heat exchanger." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 8 (2019): 2822–39. http://dx.doi.org/10.1108/hff-11-2018-0625.

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Purpose The lattice Boltzmann method is used to simulate the nanofluid flow and heat transfer inside a finned multi-pipe heat exchanger. Design/methodology/approach The heat exchanger is filled with CuO-water nanofluid. The Koo–Kleinstreuer–Li (KKL) model is used to estimate the dynamic viscosity and considering the Brownian motion in the simulation. On the other hand, the influence of nanoparticles’ shapes on the heat transfer rate is considered, and the best efficient shape is selected to be used in the investigation. Findings The Rayleigh number, nanoparticle concentration and the thermal a

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Mohamed, Hayder Anwar, and Tahseen Ahmad Tahseen. "Free convection heat transfer from radial heat sink with wing fins shape: An experimental investigation." Edelweiss Applied Science and Technology 8, no. 6 (2024): 9425–37. https://doi.org/10.55214/25768484.v8i6.4019.

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Although cylindrical heat sinks increase the surface area of heat transfer, they are frequently used as enhancers of heat transfer. Base on free convection heat transfer, fins with novel designs are used to improve thermal heat performance. The current experimental investigation examines the influence of a new-fin shape effect on the thermal behavior of a circular-base radial heat sink. Heat-supplied rates of, 136, 260,375, 589 and 808 W were the subjects of the investigation. Parametric models were used to compare the impacts of fin shape, fin number, and heat flow on the thermal resistance a

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