Measurement Techniques for Horizontal Flow Boling Heat Transfer With Pure and Mixed Refrigerants.
Measurement Techniques for Horizontal Flow Boling Heat
Transfer With Pure and Mixed Refrigerants.
Jung, D. S.; McLinden, M.; Radermacher, R.
Experimental Heat Transfer, Vol. 2, 237-255, 1989.
Sponsor:Electric Power Research Institute, Palo Alto, CA
refrigerants; heat transfer; mixtures; stainless steels;
pressure; wall temperature; pressure; wall temperature;
experiments; power supply; composition (property); data
analysis; verification; temperature measurements
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