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Condensation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes
journal contribution
posted on 2023-06-09, 15:18 authored by Alireza Sarmadian, M Shafaee, H Mashouf, S G MohseniIn the present study, condensation heat transfer and frictional pressure drops of refrigerant R-600a (iso-butane) inside a helically dimpled tube and a plain tube of internal diameter 8.3 mm were measured and analyzed. All tests were performed at different vapor qualities up to 0.82 and average saturation temperatures ranging between 38 and 42 °C. Refrigerant mass fluxes varied in the range of 114–368 kg/m2 s. The inner surface of the helically dimpled tube has been designed and reshaped through three-dimensional material surface modifications consists of both shallow and deep protrusions which are placed evenly in helical directions on the tube wall. The experimental results show that the heat transfer coefficients of the dimpled tube are 1.2–2 times of those in smooth tube with a pressure drop penalty just ranging between 58% and 195. The highest heat transfer coefficient is occurred at vapor quality of 0.53 and mass flow rate of 368 kg/m2 s. On the other hand, the maximum increase of pressure drop takes place at vapor quality of 0.55 and mass flow rate of 368 kg/m2 s.
History
Publication status
- Published
File Version
- Accepted version
Journal
Experimental Thermal and Fluid ScienceISSN
0894-1777Publisher
ElsevierVolume
86Page range
54-62Department affiliated with
- Engineering and Design Publications
Research groups affiliated with
- Dynamics, Control and Vehicle Research Group Publications
- Thermo-Fluid Mechanics Research Centre Publications
- The Sussex Energy Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-10-02First Open Access (FOA) Date
2018-11-20First Compliant Deposit (FCD) Date
2018-11-20Usage metrics
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