Assessment of heat transfer and flow characteristics of a two‐phase closed thermosiphon

Ahmed, Israa S.; Jubori, Ayad M. Al

doi:10.1002/htj.21933

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…, which is a frequently used expression for surface tension force during heat pipe simulation. Ahmed and Al Jubori and Al Jubori and Jawad discovered that the heat transfer coefficient and thermal resistance of thermosiphon could be improved at the tilt angle of 90° and fill ratio of 0.5 with a reduced temperature fluctuation. Kim and Moon presented that thermal resistance decreases with an increase of pipe diameter from 10 to 50 mm, filling ratio from 0.2 to 0.8, and heat added from 100 to 500 W. The optimal condition of thermosyphon with the aspect ratio of 0.8325, filling ratio of 0.85, and heat load of 246 W were obtained by Beiginaloo et al with the combination of CFD and DOE.…”

Section: Phase Change For Thermal Management (Tm)mentioning

confidence: 99%

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Phase change is a phenomenon that has been extensively utilized in chemical engineering, energy, electronics, vehicle, and space exploration. From both the science and engineering perspectives, gaining a profound understanding of the intricacies of multiphase flow processes accompanied by heat and mass transfer due to phase change is of fundamental importance. Indeed, the computational fluid dynamics (CFD) has been increasingly applied as an effective tool to give an in-depth and efficient analysis of the phase change processes, thereby enhancing our understanding and capacity to control and optimize the phase change effects in these processes. This paper seeks to provide a comprehensive review of the utilization of CFD methodologies in the simulations of phase change flows across various applications, including temperature management, drying, separation and purification, and others. First, the CFD models at various scales that are developed to elucidate the phase change processes are summarized. Second, the noteworthy advances in the recent CFD simulation work on various phase change processes are presented, respectively. Finally, the challenges and potential prospects to facilitate the application of the phase change flow are discussed. The current review aims to offer insightful guidance for the CFD modeling of phase change processes in numerous engineering application scenarios.

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Section: Phase Change For Thermal Management (Tm)mentioning

confidence: 99%

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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show abstract

“…Where the effect of the working fluids has been investigated to improve the heat transfer characteristic of the thermosiphon heat pipe as reported in ref. [1][2][3][4][5][6]. Moreover, some studies focused on the filling ratios, orientation, and nao-fluid technique to achieve a better performance of the conventional heat pipes and thermosiphons [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Closed Loop Pulsating Heat Pipe Using Ethanol with Different Angles

Ahmed¹,

Hussain²,

Jubori³

2021

IJHT

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In low-temperature difference, a closed-loop pulsating heat pipe (CLPHP) can be used as a cooling device due to its capability to transfer heat. The thermal performance of the CLPHP is affected by the working fluids. In this work, the effects of some operating parameters such as using ethanol as working fluid with 0.5 filling ratio, orientation, and power inputs are offered based on experimental study. Where the CLPHP was constructed and tested to achieve a better vision into the effect of orientation of 0°, 15°, 30°, 45°, and 90°, and power input of 50 W, 115 W, 215 W, and 450 W on the heat transfer characteristics and the thermal performance. The results indicated that the minimum thermal resistance can be reached at 0.1585 (℃/W) with an orientation of 90° and a power input of 450 W. The results revealed that the inclination angles and power inputs had considerable influence on the enhancement of the thermal performance of the CLPHP. For the low boiling temperature of the working fluid, the power input is more favorable because of fast startup compared with a high power input that leads to some difficulties like the dry-out phenomenon.

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“…Assim, o evaporador deve ser localizado numa posição inferior ao condensador. Enquanto houver uma diferença de temperatura entre as seções, mesmo que pequena, o processo de evaporação e condensação ocorre de forma cíclica (Zhong;Ji, 2021;Ahmed;Jubori, 2020;Mantelli, 2021). Esta tecnologia pode ser empregada em soluções para problemas térmicos em variadas áreas da engenharia, tais como: em fornos de cocção e/ou secagem, unidades de resfriamento na indústria de alimentos, na refrigeração de aeronaves, ar-condicionado e leitos de rodovias para evitar que a neve se acumule, em componentes eletrônicos, em trocadores de calor e sistemas de coletores solares para de geração de energia elétrica (Kumar;Tiwari;Said, 2021;Mantelli, 2021;Blet;Lips;Sartre, 2017).…”

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Viabilidade da aplicação de termossifão bifásico para resfriamento passivo de ambientes internos

Almeida,

Brandalise,

Fuso

et al. 2023

PARC Pesq. em Arquit. e Constr.

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Pesquisas evidenciam que está em curso um aquecimento global irreversível até o fim deste século. Tal elevação de temperaturas do planeta aumenta ainda mais a necessidade de resfriamento de ambientes internos em edifícios, onde deve se empregar tecnologias mais efetivas em termos de consumo de energia. Neste contexto, métodos de arrefecimentos passivos devem ser investigados. O presente trabalho tem como objetivo avaliar a viabilidade da aplicação de termossifões bifásicos como estratégia para resfriamento de ambientes internos. Para isso, por meio de um estudo experimental, foi utilizada uma célula-teste, integrada com uma serpentina de cobre que simulou a seção evaporadora de um termossifão. A temperatura da serpentina foi mantida prescrita e uniforme ao longo de seu comprimento por um banho de temperatura controlada. No geral, pôde-se observar que o dispositivo se mostrou capaz de extrair calor de forma passiva do ambiente, reduzindo significativamente a temperatura do ar interno. Grande parte do calor foi extraído na primeira hora e, em alguns casos, na primeira hora e meia de testes. Contudo, a transferência do calor interno foi deficiente em situações em que a diferença de temperaturas entre a serpentina e a célula foi igual ou inferior a 7°C. A distribuição da temperatura do ar interno mostrou ser similar para todos os ensaios realizados, sendo mais alta nos quadrantes superiores da célula. Além disso, velocidade de estabilização das temperaturas das superfícies internas reduziu quando a temperatura da serpentina de cobre aumentou.

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Assessment of heat transfer and flow characteristics of a two‐phase closed thermosiphon

Cited by 5 publications

References 34 publications

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Characterization of a Closed Loop Pulsating Heat Pipe Using Ethanol with Different Angles

Viabilidade da aplicação de termossifão bifásico para resfriamento passivo de ambientes internos

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