Effects of modified surface on flow and heat transfer of heat pipe

Wang, Chengchao; Qi, Cong; Han, Dongtai; Wang, Yuxing; Sun, Liang

doi:10.1140/epjp/s13360-022-02532-x

Cited by 2 publications

(2 citation statements)

References 43 publications

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“…Due to its high heat transfer coefficient, boiling heat transfer (BHT) has been used widely in heat removal and thermal management applications, such as nuclear power, solar power, electronic chip cooling, and refrigeration. − However, the physics of boiling is complex and involves multiscale processes, phase changes, interfacial interactions, and bubble growth and departure. To demonstrate BHT performance, researchers developed the well-known boiling curve. , Two important factors are used to evaluate heat transfer performance: the heat transfer coefficient (HTC), which indicates the heat transfer efficiency, and critical heat flux (CHF), which represents the heat removal capacity limitation. , Much effort has been devoted to enhancing heat transfer performance by, for instance, modifying the properties of the working fluids, − changing the heating surface character, − and introducing an external force for active regulation. − …”

Section: Introductionmentioning

confidence: 99%

Design of a Smart Wettability-Regulating Surface for Enhancing Pool Boiling Heat Transfer Using the Lattice Boltzmann Method

Hu,

Wang,

2023

Ind. Eng. Chem. Res.

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The wettability of a heating surface has a significant effect on boiling heat transfer (BHT). However, the requirements of the boiling process for surface wettability under different superheat levels change dynamically, and static wettability cannot meet this dynamic demand. Hence, based on the Rohsenow correlation and Kandlikar correlation, the best corresponding relationship between temperature and wettability was found, and a smart wettability-regulating surface with wettability varying with superheat was designed. The smart surface can easily nucleate at low superheat and has a high BHT coefficient, similar to the hydrophobic surface. Moreover, it can gradually delay the arrival of the critical heat flux as the wall superheat increases. The critical heat flux of the smart surface was the same as that of a hydrophilic surface and was 19.8% higher than that of a hydrophobic surface. It had the highest total BHT capacity, 13% better than that of a hydrophobic surface.

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Section: Introductionmentioning

confidence: 99%

Design of a Smart Wettability-Regulating Surface for Enhancing Pool Boiling Heat Transfer Using the Lattice Boltzmann Method

Hu,

Wang,

2023

Ind. Eng. Chem. Res.

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“…constructed a physical model of a heat pipe with an ordinary and modified surface to numerically simulate the thermal performance inside the heat pipe. 34 Kazemi–Beydokhti et al researched the role of new nanofluids based on multiwalled carbon nanotubes (MWCNTs) on the heat transfer efficiency of a closed-loop pulsating heat pipe (CLPHP). 35 Leu et al aimed to measure the heat transfer performance in a heat pipe cooling device under a constant heat flux condition.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effective Well Depth of Single U-Shaped Vertical Buried Pipes Based on Temperature Difference Analysis

Zhang¹,

Xin²

2023

ACS Omega

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A heat transfer model of a single U-shaped vertical buried pipe similar to an actual scenario is established, and the accuracy of the model is verified by experiments. The model is used to analyze the heat transfer performance of vertical buried pipe heat exchangers with well depths of 200, 160, 120, and 80 m. This includes the heat transfer per unit well depth, temperature change of the well wall and fluid along the pipe length, heat transfer coefficient, and section heat transfer validity. With the increase in well depth, the heat exchange per unit well depth decreases, and the proportion of heat exchange in the inlet section to the total heat exchange increases. When the well depths are 200, 160, 120, and 80 m, the last 10 m pipe sections have 30, 40.3, 53.7, and 66.4% of the heat exchange efficiencies of the initial 10 m pipe section, respectively. To obtain a reasonably effective well depth of a single U-shaped vertical buried pipe, it is necessary to comprehensively consider the heat exchange per unit well depth, the temperature difference between the well wall and the fluid, and the energy efficiency of the buried pipe section. Moreover, it should be analyzed in combination with economic factors.

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Effects of modified surface on flow and heat transfer of heat pipe

Cited by 2 publications

References 43 publications

Design of a Smart Wettability-Regulating Surface for Enhancing Pool Boiling Heat Transfer Using the Lattice Boltzmann Method

Design of a Smart Wettability-Regulating Surface for Enhancing Pool Boiling Heat Transfer Using the Lattice Boltzmann Method

Study on the Effective Well Depth of Single U-Shaped Vertical Buried Pipes Based on Temperature Difference Analysis

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