- Author
- Jung, D. S. | McLinden, M. | Radermacher, R.
- Title
- Measurement Techniques for Horizontal Flow Boling Heat Transfer With Pure and Mixed Refrigerants.
- Coporate
- Maryland Univ., College Park National Institute of Standards and Technology, Gaithersburg, MD
- Journal
- Experimental Heat Transfer, Vol. 2, 237-255, 1989
- Sponsor
- Electric Power Research Institute, Palo Alto, CA
- Keywords
- refrigerants | heat transfer | mixtures | stainless steels | pressure | wall temperature | pressure | wall temperature | experiments | power supply | composition (property) | data analysis | verification | temperature measurements
- Identifiers
- wall temperature measurement; mass flow rate measuement; power measurement; overall composition measurement; local liquid composition measurement
- Abstract
- 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.