Optimization of heat transfer in heat pipes using nanofluids at various inclinations and filling levels

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-01-01 DOI:10.1016/j.csite.2024.105624

Prabhu Alphonse , Karthikeyan Muthukumarasamy , Sivakumar Elumalai , Manikandan Kadamban , Ratchagaraja Dhairiyasamy

{"title":"Optimization of heat transfer in heat pipes using nanofluids at various inclinations and filling levels","authors":"Prabhu Alphonse , Karthikeyan Muthukumarasamy , Sivakumar Elumalai , Manikandan Kadamban , Ratchagaraja Dhairiyasamy","doi":"10.1016/j.csite.2024.105624","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the thermal performance of heat pipes filled with various nanofluids under different operational conditions, including inclination angles, filling ratios, and heat inputs. The objective was to evaluate the impact of silver (Ag), aluminum oxide (Al₂O₃), and multi-walled carbon nanotube (MWCNT) nanofluids on thermal resistance and heat transfer coefficients. Experiments were conducted using a heat pipe with a 750 mm length divided into evaporator, adiabatic, and condenser sections. Nanofluids were tested at filling ratios of 60 %, 70 %, 80 %, and 90 %, and inclination angles of 0°, 45°, 60°, and 90°. The results show that MWCNT nanofluid exhibits the lowest thermal resistance, decreasing from 1.23 K/W at 0° to 0.61 K/W at 90°, outperforming other fluids. The overall heat transfer coefficient of MWCNT increased to 4900 W/m<sup>2</sup>K at a 90 % filling ratio and 90° inclination. The study concludes that MWCNT nanofluids provide the highest thermal efficiency, particularly at steeper inclinations and higher filling ratios, making them ideal for high-performance thermal management applications.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"65 ","pages":"Article 105624"},"PeriodicalIF":6.4000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Case Studies in Thermal Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214157X24016551","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"THERMODYNAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

This study investigates the thermal performance of heat pipes filled with various nanofluids under different operational conditions, including inclination angles, filling ratios, and heat inputs. The objective was to evaluate the impact of silver (Ag), aluminum oxide (Al₂O₃), and multi-walled carbon nanotube (MWCNT) nanofluids on thermal resistance and heat transfer coefficients. Experiments were conducted using a heat pipe with a 750 mm length divided into evaporator, adiabatic, and condenser sections. Nanofluids were tested at filling ratios of 60 %, 70 %, 80 %, and 90 %, and inclination angles of 0°, 45°, 60°, and 90°. The results show that MWCNT nanofluid exhibits the lowest thermal resistance, decreasing from 1.23 K/W at 0° to 0.61 K/W at 90°, outperforming other fluids. The overall heat transfer coefficient of MWCNT increased to 4900 W/m²K at a 90 % filling ratio and 90° inclination. The study concludes that MWCNT nanofluids provide the highest thermal efficiency, particularly at steeper inclinations and higher filling ratios, making them ideal for high-performance thermal management applications.

查看原文本刊更多论文

纳米流体在不同倾角和填充水平下热管中的传热优化

研究了不同倾角、填充比和热输入条件下填充不同纳米流体的热管的热性能。目的是评估银（Ag）、氧化铝（Al₂O₃）和多壁碳纳米管（MWCNT）纳米流体对热阻和传热系数的影响。实验采用长度为750mm的热管进行，热管分为蒸发器、绝热管和冷凝器三个部分。纳米流体的填充率分别为60%、70%、80%和90%，倾角分别为0°、45°、60°和90°。结果表明，MWCNT纳米流体表现出最低的热阻，从0°时的1.23 K/W降至90°时的0.61 K/W，优于其他流体。填充率为90%、倾角为90°时，MWCNT的总传热系数提高到4900 W/m2K。该研究得出结论，MWCNT纳米流体提供了最高的热效率，特别是在更陡的倾角和更高的填充比下，使其成为高性能热管理应用的理想选择。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.