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 : 2024-12-09 DOI:10.1016/j.csite.2024.105624

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

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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.

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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.