Thermal evaluation of a heat pipe working with n-pentane-acetone and n-pentane-methanol binary mixtures

Sarafraz, M.M.; Tian, Zhe; Tlili, Iskander; Kazi, Sabeena; Goodarzi, Marjan

doi:10.1007/s10973-019-08414-2

Cited by 74 publications

(21 citation statements)

References 94 publications

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“…With significant progress in thermal engineering systems and modernization and empowerment of chemical and thermal processes, there is an ongoing effort to develop new technologies and techniques to improve heat transfer. Since large heat flux applications need special solutions/arrangements, extensive studies have been performed to improve the systems' thermal performance by new heat removal methods [1]. It has been demonstrated that nano-suspensions can promote the systems' performance by increasing the working fluid's thermal conductivity and enhancing flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

Combination Effect of Baffle Arrangement and Hybrid Nanofluid on Thermal Performance of a Shell and Tube Heat Exchanger Using 3-D Homogeneous Mixture Model

Alazwari

Safaei

2021

Mathematics

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In this study, thermal performance and flow characteristics of a shell and tube heat exchanger equipped with various baffle angles were studied. The heat exchanger was operated with distilled water, and a hybrid nanofluid at three concentrations of 0.04% and 0.10% of GNP-Ag/water within Reynolds numbers ranged between 10,000 and 20,000. The thermophysical properties of nanofluid varied with temperature and nanoparticles’ concentration. The baffle angles were set at 45°, 90°, 135°, and 180°. Results showed that the calculated Nusselt number (Nu) could be improved by adding nanoparticles to the distilled water or increasing the fluid’s Reynolds number. At a low Re number, the Nu corresponding to baffle angle of 135° was very close to that recorded for the angle of 180°. At Re = 20,000, the Nu number was the highest (by 35% compared to the reference case), belonging to a baffle angle of 135°. Additionally, results related to friction factor and pressure drop showed that more locations with fluid blocking were observed by increasing the baffle angle, resulting in increased pressure drop value and friction. Finally, the temperature streamlines counter showed that the best baffle angle could be 135° in which maximum heat removal and the best thermal performance can be observed.

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Section: Introductionmentioning

confidence: 99%

Combination Effect of Baffle Arrangement and Hybrid Nanofluid on Thermal Performance of a Shell and Tube Heat Exchanger Using 3-D Homogeneous Mixture Model

Alazwari

Safaei

2021

Mathematics

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“…For example, a pulsating heat pipe operating with a graphene-water ethylene glycol nano-suspension can be used for low-temperature heat recovery [10]. Furthermore, there are studies [11] on applying different working mediums, including n-pentane-acetone and n-pentanemethanol mixtures. The experimental results presented in this paper showed that both the fill ratio and the tilt angle were key parameters affecting the system's thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of a Cooling System Using Phase Change of a Refrigerant in a Thermosyphon

Czerwiński

Wołoszyn

2021

Energies

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With the increasing trend toward the miniaturization of electronic devices, the issue of heat dissipation becomes essential. The use of phase changes in a two-phase closed thermosyphon (TPCT) enables a significant reduction in the heat generated even at high temperatures. In this paper, we propose a modification of the evaporation–condensation model implemented in ANSYS Fluent. The modification was to manipulate the value of the mass transfer time relaxation parameter for evaporation and condensation. The developed model in the form of a UDF script allowed the introduction of additional source equations, and the obtained solution is compared with the results available in the literature. The variable value of the mass transfer time relaxation parameter during condensation rc depending on the density of the liquid and vapour phase was taken into account in the calculations. However, compared to previous numerical studies, more accurate modelling of the phase change phenomenon of the medium in the thermosyphon was possible by adopting a mass transfer time relaxation parameter during evaporation re = 1. The assumption of ten-fold higher values resulted in overestimated temperature values in all sections of the thermosyphon. Hence, the coefficient re should be selected individually depending on the case under study. A too large value may cause difficulties in obtaining the convergence of solutions, which, in the case of numerical grids with many elements (especially three-dimensional), significantly increases the computation time.

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“…Jeong and Lee 17 studied gravity heat pipes with CO 2 as the working substance and analyzed its influence on the pipes' heat transfer characteristics by changing the operating temperatures and fill rates. Previous studies 18–27 studied gravity heat pipes with nanocrystals as the working substance. The results demonstrated that nanocrystals effectively improved the pipes' heat transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

Optimum liquid filling capacity and explosion limits of naphthalene gravity heat pipes

Yan

Zou

et al. 2020

Asia-Pacific J Chem Eng

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In this study, naphthalene heat pipes were produced and filled with different materials to test the heat transfer performance. The relationship between the pipes' diameters, liquid content, wall temperature distribution, and transmission power was studied. An explosion test was designed to assess the operating temperature limit of the naphthalene heat pipes. The results demonstrated an optimum filling amount to optimize the pipes' heat transfer performance. In practical applications, it is very important to strictly control the wall temperature of naphthalene heat pipes. When the wall temperature of the evaporation section reaches approximately 600°C, they can easily explode.

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Thermal evaluation of a heat pipe working with n-pentane-acetone and n-pentane-methanol binary mixtures

Cited by 74 publications

References 94 publications

Combination Effect of Baffle Arrangement and Hybrid Nanofluid on Thermal Performance of a Shell and Tube Heat Exchanger Using 3-D Homogeneous Mixture Model

Combination Effect of Baffle Arrangement and Hybrid Nanofluid on Thermal Performance of a Shell and Tube Heat Exchanger Using 3-D Homogeneous Mixture Model

Numerical Study of a Cooling System Using Phase Change of a Refrigerant in a Thermosyphon

Optimum liquid filling capacity and explosion limits of naphthalene gravity heat pipes

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