Showing papers in "Heat Transfer Engineering in 2020"
TL;DR: In this paper, the heat transfer augmentation of turbulent single-phase flow in a concentric tube heat exchanger with short-length twisted tape inserts was numerically examined and the twisted tape length ratios were compared.
Abstract: Heat transfer augmentation of turbulent single-phase flow in a concentric tube heat exchanger with short-length twisted tape inserts was numerically examined herein. The twisted tape length ratios ...
48 citations
TL;DR: In this article, energy and exergy analyses are made during the drying process of a drying system, which is an important tool used to predict the performance of the drying system and its performance.
Abstract: Energy and exergy analysis, in the thermodynamics, is an important tool used to predict the performance of drying system. In this work, energy and exergy analyses are made during the drying process...
45 citations
TL;DR: In this paper, double jet impingement cooling of an isothermal surface with Al2O3-water nanofluid under the influence of magnetic field was performed, and the Galerkin-weighted residual finite fraction was calculated.
Abstract: Numerical study of double jet impingement cooling of an isothermal surface with Al2O3-water nanofluid under the influence of magnetic field was performed. Galerkin-weighted residual finite ...
38 citations
TL;DR: Theoretical study on the energetic and exergetic performances of a counter-flow corrugated plate heat exchanger using hybrid nanofluids for the milk chilling application has been done in this article.
Abstract: Theoretical study on the energetic and exergetic performances of a counter-flow corrugated plate heat exchanger using hybrid nanofluids for the milk chilling application has been done in th...
36 citations
TL;DR: In this paper, a three-dimensional numerical simulation of a fin structure in finned tube heat exchangers is presented, showing that dimple turbulators exhibit excellent potential for thermo-hydraulic performance enhancement.
Abstract: As a new type of fin structure in finned tube heat exchangers, dimple turbulators exhibit excellent potential for thermo-hydraulic performance enhancement. A three-dimensional numerical sim...
33 citations
TL;DR: In this paper, the thermal performance of heat exchanger is considerably enhanced by the use of inserts, such as twisted tape inserts are known for producing large heat transfer enhancements at the expense of fairly larg...
Abstract: The thermal performance of heat exchanger is considerably enhanced by the use of inserts. Twisted tape inserts are known for producing large heat transfer enhancements at the expense of fairly larg...
29 citations
TL;DR: In this article, the authors presented the thermo-hydraulic performance of printed circuit heat exchangers (PCHEs) with cambered NACA four-digit airfoil fins (AFFs) used as the condenser in supercritical CO2 Brayton...
Abstract: This paper presents the thermo-hydraulic performance of printed circuit heat exchangers (PCHEs) with cambered NACA four-digit airfoil fins (AFFs) used as the condenser in supercritical CO2 Brayton ...
25 citations
TL;DR: In this paper, a latent heat thermal energy storage system with phase change material (PCM) was numerically studied, and a highly conductive metal foam was employed with a high temperature sensor.
Abstract: A latent heat thermal energy storage system with phase change material (PCM) is numerically studied. To enhance the heat transfer inside the system, a highly conductive metal foam is employed with ...
25 citations
TL;DR: In this article, an experimental analysis was done to investigate the thermal performance of a thermosyphon heat pipe (THP) using three working fluids, namely, distilled water, nanofluid, and a mixture of nanofluid...
Abstract: An experimental analysis is done to investigate the thermal performance of a thermosyphon heat pipe (THP) using three working fluids, namely, distilled water, nanofluid, and a mixture of nanofluid ...
22 citations
TL;DR: In this article, the authors show that overall thermal conductance in a rectangular microchannel heat sink can be maximized with the combination of nanofluids and micro pin fin.
Abstract: Here, we show that overall thermal conductance in a rectangular microchannel heat sink can be maximized with the combination of nanofluids and micro pin fins. We uncover the effect of micro pin fin...
21 citations
TL;DR: In this paper, a numerical simulation of a metal foam heat exchanger system carried out by a commercial software is described, in which a foam layer is attached to the bottom of the heat exchangers.
Abstract: This article discusses about a numerical simulation of a metal foam heat exchanger system carried out by a commercial software. A metal foam layer is attached to the bottom of the heat exch...
TL;DR: The high efficiency of concentrated solar power (CSP) in energy conversion makes it a very attractive device for using solar energy as a substitute of non-renewable energy sources as discussed by the authors.
Abstract: The high efficiency of concentrated solar power (CSP) in energy conversion makes it a very attractive device for using solar energy as a substitute of nonrenewable energy sources. The open volumetr...
TL;DR: In this article, the dominated components of natural gas and the important components in mixture refrigerants for the mixture Joule-Thomson refrigeration cycle were discussed. But the authors did not consider the effect of the temperature on the performance of the mixture.
Abstract: Methane (R50) and ethane (R170) are the dominated components of natural gas and the important components in mixture refrigerants for the mixture Joule–Thomson refrigeration cycle. In this a...
TL;DR: In this paper, the cleaning behavior of a pre-wetted soil is studied experimentally and modeled numerically for the prototypical case of plane channel flow, where one of the channel walls is soiled with a food-based mo...
Abstract: The cleaning behavior of a pre-wetted soil is studied experimentally and modeled numerically for the prototypical case of plane channel flow. One of the channel walls is soiled with a food-based mo...
TL;DR: In this paper, the thermal performance of Al2O3/water nanofluid flows through a rectangular microchannel heat sink with constant heat flux boundary condition is numerically investigated.
Abstract: In this study, the thermal performance of Al2O3/water nanofluid flows through a rectangular microchannel heat sink with constant heat flux boundary condition is numerically investigated. A ...
TL;DR: In this paper, two-dimensional numerical simulations of flow-assisted mixed convection in a vertical channel filled with high porosity metal foams have been carried out by using the commercial ANSYS simulator.
Abstract: In this work, two-dimensional numerical simulations of flow-assisted mixed convection in a vertical channel filled with high porosity metal foams have been carried out by using the commercial ANSYS...
TL;DR: In order to increase the thermal efficiency, the gas turbines are designed to operate at higher temperature, which requires highly efficient cooling structures for turbine blades as discussed by the authors, such as dimples and r...
Abstract: In order to increase the thermal efficiency, the gas turbines are designed to operate at higher temperature, which requires highly efficient cooling structures for turbine blades. The dimples and r...
TL;DR: In this paper, three-dimensional numerical simulations are successfully carried out on thermo-hydraulic characteristics of a new plain fin-and-elliptical tube (PFET) heat exchanger with innovative types of filters.
Abstract: Three-dimensional numerical simulations are successfully carried out on thermo-hydraulic characteristics of a new plain fin-and-elliptical tube (PFET) heat exchanger with innovative types o...
TL;DR: In this paper, the forced convective heat transfer was experimentally studied in packed beds with uniform and non-uniform spheres, and the pore structures of different packings were evaluated.
Abstract: In the present paper, the forced convective heat transfer was experimentally studied in packed beds with uniform and non-uniform spheres. The pore structures of different packings were reco...
TL;DR: A comprehensive computational model capable of simulating fouling layer thickness evolution using dynamic mesh model is presented and deposit evolution has been calculated inside different heat exchanger technologies used in exhaust gas recirculation systems to analyze fouling process.
Abstract: This article presents a comprehensive computational model capable of simulating fouling layer thickness evolution using dynamic mesh model This computational methodology has been developed to repr
TL;DR: In this paper, the effect of horizontal spacing between two horizontally aligned circular cylinders on laminar natural convection to non-Newtonian power-law fluids has been investigated, and numerical computations have been carried out.
Abstract: This paper expounds the effect of horizontal spacing between two horizontally aligned circular cylinders on laminar natural convection to non-Newtonian power-law fluids. Numerical computations have...
TL;DR: In this article, experimental data pertinent to deionized water pool boiling across 10 mm thick aluminum foams are presented, and the tradeoff between these two effects is investigated through the use of high-speed camera recording, bubble generation, trajectory and growth rate were analyzed and critically discussed as functions of the working conditions and of the foam geometry.
Abstract: In this paper, experimental data pertinent to deionized water pool boiling across 10 mm thick aluminum foams are presented. Two foam samples with different pore densities, 5 and 10 pores per inch, yet an identical mean porosity of 0.92 are tested. Compared to a heated flat plate, of the same base size, the foams offer higher heat transfer area albeit at induced bubble escaping resistance. The tradeoff between these two effects is investigated. Through the use of high-speed camera recording, bubble generation, trajectory and growth rate were analyzed and critically discussed as functions of the working conditions and of the foam geometry. Furthermore, the experimental data were compared against a correlation appositely proposed for water pool boiling on metal foams. A good degree of agreement was observed.
TL;DR: In this paper, mixed convection flow in a lid-driven cavity in the presence of a uniform partial magnetic field was investigated utilizing the pseudo spectral method based on polyharmonic spline radial basis funct...
Abstract: Mixed convection flow in a lid-driven cavity in the presence of a uniform partial magnetic field is investigated utilizing the pseudo spectral method based on polyharmonic spline radial basis funct...
TL;DR: In this paper, the characterization of many innovative modified surface treatment methods is presented, including surface treatment as an efficient, and environmentally friendly approach toward fouling mitigation, as well as surface treatment with surface treatment.
Abstract: As much as attention that has been paid to surface treatment as an efficient, and environmentally friendly approach toward fouling mitigation, the characterization of many innovative modified surfa...
TL;DR: In this paper, the influence of copper ageing on flow boiling heat transfer and pressure drop in copper microchannels of two different hydraulic diameters was investigated, and the experimental results showed that the influence was negligible.
Abstract: The study reports the experimental investigation on the influence of copper ageing on flow boiling heat transfer and pressure drop in copper microchannels of two different hydraulic diamete...
TL;DR: In this paper, the authors presented the creation of 3D maps for selection of best Colebrook friction factor approximation for three-dimensional (3D) maps for 3D CAD models.
Abstract: This paper presents the creation of three-dimensional (3D) maps for selection of best Colebrook friction factor approximation. Twenty Colebrook approximations are observed in range of Reynolds numb...
TL;DR: In this article, Earth-to-air (EAHX) and/or air-toair (AAHX), heat exchangers can be conveniently inserted in heating, ventilation, and air conditioning (HVAC) systems to obtain relevant energy saving.
Abstract: Earth-to-air (EAHX) and/or air-to-air (AAHX) heat exchangers can be conveniently inserted in heating, ventilation, and air conditioning (HVAC) systems to obtain relevant energy saving. In this arti...
TL;DR: The coupling between mixed convection and surface radiation in a square cavity, with a vertical wall heated and driven, and the opposite one subjected to a non-uniform temperature that exhi... as discussed by the authors.
Abstract: The coupling between mixed convection and surface radiation in a square cavity, with a vertical wall heated and driven, and the opposite one subjected to a non-uniform temperature that exhi...
TL;DR: In this article, the authors considered the problem of Laminar free convection in a vertical channel with isothermal walls, where the channel walls may be at different temperatures, leading to a different heat transfer problem.
Abstract: Laminar free convection in a vertical channel with isothermal walls is a classical heat transfer problem. In general, the channel walls may be at different temperatures, leading to a differ...
TL;DR: In this paper, a proton exchange membrane (PEM) fuel cell produces water during its operation which results in a liquid-gas two-phase flow within its flow channels.
Abstract: A proton exchange membrane (PEM) fuel cell produces water during its operation which results in a liquid-gas two-phase flow within its flow channels. Because the length scales associated with flow ...