年間 8 号発行
ISSN 印刷: 1065-5131
ISSN オンライン: 1563-5074
Indexed in
EFFECT OF ASPECT RATIO ON EVAPORATION HEAT TRANSFER AND PRESSURE DROP OF R-410A IN FLATTENED MICROFIN TUBES
要約
In this study, evaporation heat transfer coefficients and pressure drops of R-410A were obtained in flattened microfin tubes (AR = 2, 4) made from 7.0 mm O.D. round microfin tube. The test range covered mass flux from 200 to 400 kg/m2s. The heat flux and saturation temperature were fixed at 10 kW/m2 and 15° C. Both the evaporation heat transfer coefficient and the frictional pressure drop increased as quality or mass flux increased. They also increased as the tube aspect ratio increased. The heat transfer enhancement ratio ranged from 1.51 to 3.08, which increased as mass flux decreased. However, the pressure drop penalty factors were less than 1.0. Comparison with existing round microfin tube correlations was made.
-
Yang Cheng-Min, Hrnjak Pega, Effect of straight micro fins on heat transfer and pressure drop of R410A during evaporation in round tubes, International Journal of Heat and Mass Transfer, 117, 2018. Crossref
-
Ayub Zahid H., Ayub Adnan H., Ribatski Gherhardt, Moreira Tiago Augusto, Khan Tariq S., Two-phase pressure drop and flow boiling heat transfer in an enhanced dimpled tube with a solid round rod insert, International Journal of Refrigeration, 75, 2017. Crossref
-
Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Flow Boiling Enhancement Techniques, in Two-Phase Heat Transfer Enhancement, 2020. Crossref
-
Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Internally Finned Tubes and Spirally Fluted Tubes, in Heat Transfer Enhancement in Externally Finned Tubes and Internally Finned Tubes and Annuli, 2020. Crossref