Measurement Techniques for Horizontal Flow Boiling Heat Transfer With Pure and Mixed Refrigerants
D. S. Jung, Mark O. McLinden, R Radermacher
A test rig and measurement techniques for horizontal flow boiling of pure and mixed refrigerants are described. Local heat transfer coefficients were measured for R22/R114 and R12/R152a mixtures as well as the corresponding pure components. The test section consists of an 8-m-Iong, 9.1-mm-i-d., electrically heated stainless steel tube and has the distinctive feature of variable heated length. Details of pressure, composition, and fluid and wall temperature measurements are discussed. The composition of sub-cooled liquid entering test section varied form test to test and it is recommended that it be measured for each test. For the R22/R114 mixture, local composition measurements in the annular liquid film revealed a composition variation of up to 0.07 mole fraction around the circumference of the heated tube.
, McLinden, M.
and Radermacher, R.
Measurement Techniques for Horizontal Flow Boiling Heat Transfer With Pure and Mixed Refrigerants, Experimental Heat Transfer, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910715
(Accessed December 10, 2023)