Influence of thermophysical properties on pool boiling heat transfer of refrigerants

摘要: Abstract The correct prediction of the heat transfer performance boiling liquid within evaporator a refrigeration unit is one essential features for successful operation whole unit. A theoretically consistent calculation method coefficient α in nucleate boiling, which should be based on physical phenomena connected with vapour bubbles growing, departing and sliding wall interactions neighbouring nucleation sites microstructure heating surface, does not yet exist, despite increasing number papers subject recent past. Instead, predictive methods available at present are empirical or semiempirical, especially conditions relevant practice. Many these correlations have been established form power laws relative influences main groups variables treated by separate factors. One may stand influence thermophysical properties will included several New experimental results presented pool from single horizontal copper tube (8 mm OD) to HFC-refrigerants (R32, 125, 134a, 143a, 152a, 227ea) hydrocarbons (propane, i -butane). compared data literature, discussed, how incorporate semiempirical describe fluids performance.