A visual study of two-phase flow patterns of HFC-134a and lubricant oil mixtures

Somchai Wongwises; Tawatchai Wongchang; Jatuporn Kaewon; Chi-Chuan Wang

doi:10.1080/01457630290090464

A visual study of two-phase flow patterns of HFC-134a and lubricant oil mixtures

Somchai Wongwises, Tawatchai Wongchang, Jatuporn Kaewon, Chi-Chuan Wang

Department of Mechanical Engineering

Research output: Contribution to journal › Article

29 Scopus citations

Abstract

The two-phase flow patterns of HFC-134a with lubricant oil mixtures inside a smooth horizontal tube were experimentally elucidated. Tests were performed in an inside diameter of 7.8 mm having a lubricating oil concentration of 5%. Tests were made of mass fluxes ranging between 150 and 590 kg/m² s. The most obvious difference from oil-free cases reported is the presence of froth flow pattern. Apparently, this flow pattern is related to the increase of surface tension and viscosity. With the presence of lubricant oil, the onset of transition from stratified flow region to annular flow regime shifted to a lower value of superficial gas velocity. In addition, the tearing phenomenon of the refrigerant-oil mixtures may be related to its relevant properties such as wettability and surface tension.

Original language	English
Pages (from-to)	13-22
Number of pages	10
Journal	Heat Transfer Engineering
Volume	23
Issue number	4
DOIs	https://doi.org/10.1080/01457630290090464
State	Published - 1 Jan 2002

Access to Document

10.1080/01457630290090464

Link to publication in Scopus

Fingerprint Dive into the research topics of 'A visual study of two-phase flow patterns of HFC-134a and lubricant oil mixtures'. Together they form a unique fingerprint.

Cite this

Wongwises, S., Wongchang, T., Kaewon, J., & Wang, C-C. (2002). A visual study of two-phase flow patterns of HFC-134a and lubricant oil mixtures. Heat Transfer Engineering, 23(4), 13-22. https://doi.org/10.1080/01457630290090464

@article{3dca88adf37c445094290c8c8ff267df,

title = "A visual study of two-phase flow patterns of HFC-134a and lubricant oil mixtures",

abstract = "The two-phase flow patterns of HFC-134a with lubricant oil mixtures inside a smooth horizontal tube were experimentally elucidated. Tests were performed in an inside diameter of 7.8 mm having a lubricating oil concentration of 5%. Tests were made of mass fluxes ranging between 150 and 590 kg/m2 s. The most obvious difference from oil-free cases reported is the presence of froth flow pattern. Apparently, this flow pattern is related to the increase of surface tension and viscosity. With the presence of lubricant oil, the onset of transition from stratified flow region to annular flow regime shifted to a lower value of superficial gas velocity. In addition, the tearing phenomenon of the refrigerant-oil mixtures may be related to its relevant properties such as wettability and surface tension.",

author = "Somchai Wongwises and Tawatchai Wongchang and Jatuporn Kaewon and Chi-Chuan Wang",

year = "2002",

month = jan,

day = "1",

doi = "10.1080/01457630290090464",

language = "English",

volume = "23",

pages = "13--22",

journal = "Heat Transfer Engineering",

issn = "0145-7632",

publisher = "Taylor and Francis Ltd.",

number = "4",

}

TY - JOUR

T1 - A visual study of two-phase flow patterns of HFC-134a and lubricant oil mixtures

AU - Wongwises, Somchai

AU - Wongchang, Tawatchai

AU - Kaewon, Jatuporn

AU - Wang, Chi-Chuan

PY - 2002/1/1

Y1 - 2002/1/1

N2 - The two-phase flow patterns of HFC-134a with lubricant oil mixtures inside a smooth horizontal tube were experimentally elucidated. Tests were performed in an inside diameter of 7.8 mm having a lubricating oil concentration of 5%. Tests were made of mass fluxes ranging between 150 and 590 kg/m2 s. The most obvious difference from oil-free cases reported is the presence of froth flow pattern. Apparently, this flow pattern is related to the increase of surface tension and viscosity. With the presence of lubricant oil, the onset of transition from stratified flow region to annular flow regime shifted to a lower value of superficial gas velocity. In addition, the tearing phenomenon of the refrigerant-oil mixtures may be related to its relevant properties such as wettability and surface tension.

AB - The two-phase flow patterns of HFC-134a with lubricant oil mixtures inside a smooth horizontal tube were experimentally elucidated. Tests were performed in an inside diameter of 7.8 mm having a lubricating oil concentration of 5%. Tests were made of mass fluxes ranging between 150 and 590 kg/m2 s. The most obvious difference from oil-free cases reported is the presence of froth flow pattern. Apparently, this flow pattern is related to the increase of surface tension and viscosity. With the presence of lubricant oil, the onset of transition from stratified flow region to annular flow regime shifted to a lower value of superficial gas velocity. In addition, the tearing phenomenon of the refrigerant-oil mixtures may be related to its relevant properties such as wettability and surface tension.

UR - http://www.scopus.com/inward/record.url?scp=0036645033&partnerID=8YFLogxK

U2 - 10.1080/01457630290090464

DO - 10.1080/01457630290090464

M3 - Article

AN - SCOPUS:0036645033

VL - 23

SP - 13

EP - 22

JO - Heat Transfer Engineering

JF - Heat Transfer Engineering

SN - 0145-7632

IS - 4

ER -