Abstract
An experimental investigation has been carried out to evaluate the characteristics of the evaporation heat transfer within a rifled tube for R22 refrigerant. This study is mainly aimed at evaluating the contribution of the rifle tubes to the heat transfer coefficient in horizontal boiling flow and comparison of the results with the flow within the smooth tubes. The test section is made of a six head rifled tube with a length of 2 m, which is uniformly heated by the joule heating effect. The range of test parameters included the evaporation temperatures from 4 to 15 \(^\circ C\), the heat flux range of 5–17 kW/m2, the refrigerant mass flux of 70–350 kg/m2s, and the quality range of 0.1 to 0.8. The results showed that increased vapor quality and temperature led to increased heat transfer coefficient within the rifled tubes. Also, increased heat flux and mass flux resulted in an increased heat transfer coefficient. The enhancement of heat transfer coefficients of approximately 28 to 56% (i.e., enhancement factors of 1.28 to 1.56) have been recorded compared to the smooth tube for qualities of 0.3 and 0.7, respectively. In lower mass fluxes, the enhancement factor increases significantly; however, as mass flux is further increased, the enhancement factor is reduced and approaches a constant value. As a result, the use of rifled tubes in high-quality flows at lower mass fluxes enhances heat transfer significantly.
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Kazerooni, R.B., Bakhtiarpour, M.A. & Noghrehabadi, A. Experimental study of flow boiling heat transfer in horizontal rifled tube. Heat Mass Transfer 59, 477–487 (2023). https://doi.org/10.1007/s00231-022-03252-9
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DOI: https://doi.org/10.1007/s00231-022-03252-9