Details
| Original language | English |
|---|---|
| Article number | 061501 |
| Number of pages | 9 |
| Journal | Journal of Heat Transfer |
| Volume | 130 |
| Issue number | 6 |
| Early online date | 23 Apr 2008 |
| Publication status | Published - Jun 2008 |
| Externally published | Yes |
Abstract
Local heat transfer coefficients for flow boiling of pure 1,1,1,2-tetrafluoroethane (R134a) and binary mixtures of propane (R290) and R134a were measured. The experimental setup employed a vapor heated plain horizontal tube (di = 10 mm, do = 12 mm, L = 500 mm). The measurements covered a wide range of saturation temperatures (233 ≤Ts≤278 K), mass fluxes (100≤ṁ≤300 kg/m2 s), qualities (0≤ẋ≤1), and concentrations (0≤z̃≤0.65). In the zeotropic region of R134a/R290 mixtures, the measured local heat transfer coefficient was found to show a maximum decrease by a factor of 2 relative to that for pure R134a. At the azeotropic point (65% R290), it was found to increase by a factor of 1.2. The measured local heat transfer coefficients for both R134a and R134a/R290 were compared with a number of correlations.
Keywords
- Flow boiling, Mixture, Propane, R134a
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Journal of Heat Transfer, Vol. 130, No. 6, 061501, 06.2008.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Flow boiling of R134a and R134a/propane mixtures at low saturation temperatures inside a plain horizontal tube
AU - Rabah, A.
AU - Kabelac, S.
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/6
Y1 - 2008/6
N2 - Local heat transfer coefficients for flow boiling of pure 1,1,1,2-tetrafluoroethane (R134a) and binary mixtures of propane (R290) and R134a were measured. The experimental setup employed a vapor heated plain horizontal tube (di = 10 mm, do = 12 mm, L = 500 mm). The measurements covered a wide range of saturation temperatures (233 ≤Ts≤278 K), mass fluxes (100≤ṁ≤300 kg/m2 s), qualities (0≤ẋ≤1), and concentrations (0≤z̃≤0.65). In the zeotropic region of R134a/R290 mixtures, the measured local heat transfer coefficient was found to show a maximum decrease by a factor of 2 relative to that for pure R134a. At the azeotropic point (65% R290), it was found to increase by a factor of 1.2. The measured local heat transfer coefficients for both R134a and R134a/R290 were compared with a number of correlations.
AB - Local heat transfer coefficients for flow boiling of pure 1,1,1,2-tetrafluoroethane (R134a) and binary mixtures of propane (R290) and R134a were measured. The experimental setup employed a vapor heated plain horizontal tube (di = 10 mm, do = 12 mm, L = 500 mm). The measurements covered a wide range of saturation temperatures (233 ≤Ts≤278 K), mass fluxes (100≤ṁ≤300 kg/m2 s), qualities (0≤ẋ≤1), and concentrations (0≤z̃≤0.65). In the zeotropic region of R134a/R290 mixtures, the measured local heat transfer coefficient was found to show a maximum decrease by a factor of 2 relative to that for pure R134a. At the azeotropic point (65% R290), it was found to increase by a factor of 1.2. The measured local heat transfer coefficients for both R134a and R134a/R290 were compared with a number of correlations.
KW - Flow boiling
KW - Mixture
KW - Propane
KW - R134a
UR - http://www.scopus.com/inward/record.url?scp=46049097438&partnerID=8YFLogxK
U2 - 10.1115/1.2897345
DO - 10.1115/1.2897345
M3 - Article
AN - SCOPUS:46049097438
VL - 130
JO - Journal of Heat Transfer
JF - Journal of Heat Transfer
SN - 0022-1481
IS - 6
M1 - 061501
ER -