Microjet array single-phase and flow boiling heat transfer with R134a

✍ Scribed by Eric A. Browne; Gregory J. Michna; Michael K. Jensen; Yoav Peles

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 761 KB
• Volume: 53
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/j.ijheatmasstransfer.2010.07.062

✦ Synopsis

An experimental study of single-phase and flow boiling heat transfer of a submerged microjet array was conducted with R134a. The staggered array of seventeen 112-lm diameter orifices impinged onto a 1 Â 1-mm heater. Single-phase data were gathered over the range 3050 6 Re d 6 10,600 with 53:6 6 Nu d 6 128. Boiling experiments were conducted with liquid subcoolings of 10, 20, and 30 °C at jet velocities of 4, 7, and 10 m/s. Boiling was generally found to enhance heat transfer with a maximum heat flux of 590 W/cm 2 . However, temperature excursions occurred at low superheats and were found to be related to non-condensable gas content.