Evaporation accepted.pdf (1.53 MB)
Evaporation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes
journal contribution
posted on 2023-06-09, 15:19 authored by M Shafaee, H Mashouf, Alireza Sarmadian, S G MohseniAn experimental investigation was performed to evaluate the heat transfer and pressure drop characteristics of the hydrocarbon refrigerant R-600a during flow boiling inside a horizontal smooth tube with an inside diameter of 8.25 mm and a newly developed dimpled tube. The inner surface of the helically dimpled tube is enhanced by a newly modified pattern consists of both shallow and deep protrusions. The experimental tests were carried out varying: the refrigerant mass fluxes within the range of 155–470 kg/m2 s; the vapor qualities up to 0.8; the constant heat flux of 15.8 and saturation temperature of 56.5 °C. Observations clearly indicate that the heat transfer performance is improved as tube’s inner surface enhanced by this new pattern of protrusions. The experimental results show that the heat transfer coefficients of the dimpled tube are 1.29–2 times larger than a smooth tube with a pressure drop just ranging between 7% and 103% larger than the smooth tube. The highest enhancement in the heat transfer coefficient occurs at vapor quality of 0.2 and mass flow rate of 155 kg/m2 s. On the other hand, the maximum increase of pressure drop takes place at vapor quality of 0.8 and mass flow rate of 305 kg/m2 s.
History
Publication status
- Published
File Version
- Accepted version
Journal
Applied Thermal EngineeringISSN
1359-4311Publisher
ElsevierVolume
107Page range
28-36Department 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
2018-10-03First Compliant Deposit (FCD) Date
2018-10-02Usage metrics
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