Heat transfer enhancement by diamond nanofluid in gravity heat pipe for waste heat recovery

Ning Qian; Fan Jiang; Jiajia Chen; Yucan Fu; Jingzhou Zhang; Jiuhua Xu

doi:10.1080/26941112.2022.2163594

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Heat transfer enhancement by diamond nanofluid in gravity heat pipe for waste heat recovery

Research Article | Updated：2023-01-05

- Heat transfer enhancement by diamond nanofluid in gravity heat pipe for waste heat recovery
- Functional Diamond Vol. 2, Issue 1, Pages: 236-244(2022)
- Affiliations：
  
  1. a College of Mechanical and Electrical Engineering Nanjing University of Aeronautics Nanjing China
  2. c JITRI Institute of Precision Manufacturing
  3. a College of Mechanical and Electrical Engineering Nanjing University of Aeronautics
  4. b College of Mechanical and Electrical Engineering Nanjing Forestry University
- Author bio：
- Funds：
- DOI：10.1080/26941112.2022.2163594
  CLC：
- Online First：05 January 2023，
  
  Published：2022
- Accepted：
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Ning Qian, Fan Jiang, Jiajia Chen, et al. Heat transfer enhancement by diamond nanofluid in gravity heat pipe for waste heat recovery[J]. Functional Diamond2022, 2(1): 236-244.
DOI：

Ning Qian, Fan Jiang, Jiajia Chen, et al. Heat transfer enhancement by diamond nanofluid in gravity heat pipe for waste heat recovery[J]. Functional Diamond2022, 2(1): 236-244. DOI： 10.1080/26941112.2022.2163594.

摘要

Abstract

Waste heat recovery is significant for improving energy utilization

reducing carbon emissions

and neutrality. The gravity heat pipe (GHP) has excellent thermal performance due to the cyclic phase transformation of the working fluid. As an important thermal management device for waste heat recovery

the heat transport capacity of GHP improves

the efficiency and performance of the waste heat recovery increase

and more wasted heat can be stored more quickly. Nano-diamond has the highest thermal conductivity and can be dispersed in water to form a diamond nanofluid

enhancing the thermal performance of GHP. In contrast

the study on the heat transfer behavior of the diamond nanofluid in GHP is insufficient. Besides

the influences of filling ratio (FR)

mass fraction (MF)

and heat flux on thermal performance are in demand for further study. In this article

the heat transfer behavior is investigated by studying the flow patterns of diamond nanofluids. The influences of filling ratio and mass fraction on flow patterns are analyzed. An orthogonal experiment is conducted; the heat flux has the most significant effect on the thermal performance

followed by t

he filling ratio and mass fraction. The thermal performance is the best when the optimal parameters (FR = 20%

MF = 1 w.t.%) are selected under a heat flux of 20 × 10

W/m

. The equivalent heat transfer coefficient reaches 3485 W/(m

·°C). This article can achieve a deeper understanding of the diamond nanofluid heat transfer mechanism in GHP and enhance the thermal performance of GHP for better waste heat recovery.

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