Effect of graphite nanolubricant on R600a flow boiling heat transfer

CHEN Mengxun; ZHANG Hua; LOU Jiangfeng

doi:10.11949/j.issn.0438-1157.20150761

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Effect of graphite nanolubricant on R600a flow boiling heat transfer

更新时间：2025-12-10

- Effect of graphite nanolubricant on R600a flow boiling heat transfer
- CIESC Journal Issue 11, Pages: 4394-4400(2015)
- 作者机构：
  
  1. 上海理工大学能源与动力工程学院,上海,200093
  2. 浙江盾安人工环境设备股份有限公司, 浙江诸暨,311835
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150761
  CLC： B61+2TB383
- Online First：05 November 2015，
  
  Published：05 November 2015
- 稿件说明：
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CHEN Mengxun, ZHANG Hua, LOU Jiangfeng. Effect of graphite nanolubricant on R600a flow boiling heat transfer[J]. CIESC Journal, 2015, (11): 4394-4400.
DOI：

CHEN Mengxun, ZHANG Hua, LOU Jiangfeng. Effect of graphite nanolubricant on R600a flow boiling heat transfer[J]. CIESC Journal, 2015, (11): 4394-4400. DOI： 10.11949/j.issn.0438-1157.20150761.

摘要

搭建了纳米冷冻机油/制冷剂水平光管内流动沸腾换热测试实验台

研究了石墨/R600a纳米制冷剂在水平直光管内流动沸腾换热特性

分析了纳米石墨对含油制冷剂流动沸腾换热的影响。实验测试段为总长2.5 m、外径9.52 mm、内径8 mm、壁厚0.76 mm的紫铜管。在质量流速为150、200、250、300 kg·m-2·s-1下

分别测量纯R600a、含油R600a、不同质量分数(0.05%、0.1%、0.2%)纳米石墨冷冻机油和R600a混合物在水平光滑圆管内流动沸腾传热系数随干度的变化趋势。实验结果表明:纳米石墨的添加增强了含油制冷剂的流动沸腾换热。实验获得了基于石墨的含油纳米制冷剂流动沸腾换热关联式

关联式的预测值与94.5%的实验数据偏差在±15%以内。

Abstract

A test rig with a horizontal smooth tube was built to measure flow boiling heat transfer of nanolubricant/refrigerant. The experimental study on heat transfer characteristics of graphite-nanorefrigerant flow boiling inside a horizontal smooth copper tube

with total length of 2.5 m

outside diameter of 9.52 mm

inside diameter of 8 mm and wall thickness of 0.76 mm was performed. Influence of graphite on flow boiling heat transfer characteristics of nanorefrigerant/oil mixture was investigated. There were three kinds of fluid under experiment:R600a

R600a/oil and graphite nanorefrigerant/oil with different graphite mass fractions (0.05%

0.1% and 0.2%). Flow boiling heat transfer coefficients of these fluid versus vapor quality were measured respectively in a horizontal smooth tube under the mass flow density of 150

200

250

300 kg·m-2·s-1. The results indicated that the presence of graphite enhanced the flow boiling heat transfer. A correlation for predicting the flow boiling heat transfer coefficient of nanorefrigerant/oil mixture with graphite was proposed and it agreed with 94.5% of the experimental data within a deviation of ±15%.

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