Dryout Characteristics During Flow Boiling of R134a in Vertical Circular Minichannels
2011 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, Vol. 54, no 11-12, 2434-2445 p.Article in journal (Refereed) Published
In this paper, the experimental results of dryout during flow boiling in minichannels are reported and analysed. Experiments were carried out in vertical circular minichannels with internal diameters of 1.22 mm and 1.70 mm and a fixed heated length of 220 mm. R134a was used as working fluid. Mass flux was varied from 50 kg/m(2) s to 600 kg/m(2) s and experiments were performed at two different system pressures corresponding to saturation temperatures of 27 degrees C and 32 degrees C. Experimental results show that the dryout heat flux increases with mass flux and decreases with tube diameter while system pressure has no clear effect for the range of experimental conditions covered. Finally, the prediction capabilities of the well known critical heat flux (CHF) correlations are also tested.
Place, publisher, year, edition, pages
2011. Vol. 54, no 11-12, 2434-2445 p.
Microchannels, Critical heat flux, Dryout, Flow boiling, Heat transfer, R134a
IdentifiersURN: urn:nbn:se:kth:diva-27139DOI: 10.1016/j.ijheatmasstransfer.2011.02.018ISI: 000289820100023ScopusID: 2-s2.0-79953058604OAI: oai:DiVA.org:kth-27139DiVA: diva2:374767
QC 20101206 Uppdaterad från accepted till published (20110518).2010-12-062010-12-062011-05-18Bibliographically approved