Flow boiling heat transfer of carbon dioxide with PAG-type lubricating oil in pre-dryout region inside horizontal tube

被引：20
|
作者：
Li, Minxia [1 ]
Dang, Chaobin [2 ]
Hihara, Eiji [2 ]
机构：
[1] Tianjin Univ, MOE, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300072, Peoples R China
[2] Univ Tokyo, Grad Sch Frontier Sci, Dept Human & Engn Environm, Kashiwa, Chiba 2778563, Japan
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2014年 / 41卷
关键词：
Carbon dioxide; Heat transfer coefficient; Correlation; Lubricating oil; Boiling heat transfer; GENERAL CORRELATION; TRANSFER MODEL; REFRIGERANTS;
D O I：
10.1016/j.ijrefrig.2013.06.001
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A flow boiling heat transfer model for horizontal tubes is proposed for CO2 with entrained polyalkylene glycol (PAG) type lubricating oil in the pre-dryout region. A general power law-type model with a power number of 3 is used together with the average thermodynamic properties of the CO2-oil mixture. A convective enhancement factor (F) is recommended according to the relationship between the Lockhart-Martinelli parameter and the ratio alpha(tp)/alpha(1), which was obtained based on previous experimental results for CO2 and oil. A new suppression factor (S) is introduced that comprises a suppression term for forced convection and oil concentration term for bubble generation. A comparison of six correlations showed that the proposed correlation can depict the influence of the mass and heat fluxes on both nucleate and convection boiling reasonably well. Crown Copyright (C) 2013 Published by Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码：45 / 59
页数：15
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