Enhanced Thermal Conductivity of Carboxyl (–COOH) Functionalized Multi-Walled Carbon Nanotube (MWCNT)-Silicone Oil Based Nanofluids

Sensor Letters Pub Date : 2020-01-01 DOI:10.1166/sl.2020.4188

M. Premalatha, N. Preetha, S. Padmavathi, A. Jeevaraj

引用次数: 1

Abstract

Thermal conductivity and viscosity studies of carboxyl (–COOH) functionalized multi-walled carbon nanotubes-Silicone oil nanofluids were discussed in this work. Carboxyl (–COOH) functionalized MWCNT-Silicone oil nanofluids were prepared in various concentration ranges from 0.001 to 0.005 g of COOH-MWCNT and characterized at a range of temperatures between 303 K to 323 K. The thermal conductivity of carboxyl (–COOH) functionalized MWCNT-Silicone oil nanofluids increases with the raise in concentration of MWCNTs and also with the raise in temperatures. Mechanism for the enhancement of Silicone oil with concentration of MWCNT is due to the percolation of heat through the nanotubes through axial direction than through radial direction. Because of large aspect ratio of nanotubes heat transfer inside MWCNTs is also more. Also, as the temperature increases the viscosity of the (–COOH) functionalized MWCNT-Silicone oil nanofluids decreases, because CNT aggregation kinetics may contribute resulting in enhanced thermal conductivity.

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羧基(-COOH)功能化多壁碳纳米管(MWCNT)-硅油基纳米流体的热导率增强

对羧基(-COOH)功能化多壁碳纳米管-硅油纳米流体的导热性和粘度进行了研究。羧基(-COOH)功能化的mwcnt -硅油纳米流体在0.001 ~ 0.005 g COOH-MWCNT的浓度范围内制备，在303 ~ 323 K的温度范围内表征。羧基(-COOH)功能化MWCNTs -硅油纳米流体的导热系数随MWCNTs浓度的升高和温度的升高而增加。硅油随纳米碳管浓度的增加而增强的机理是由于热通过纳米管的轴向渗透而不是径向渗透。由于纳米管宽高比大，纳米碳纳米管内部的传热也更多。此外，随着温度的升高，(-COOH)功能化的mwcnt -硅油纳米流体的粘度降低，因为碳纳米管的聚集动力学可能导致导热性增强。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensor Letters 工程技术-电化学

自引率

0.00%

发文量

审稿时长

6 months

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