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Flow boiling experiments were carried out to investigate the critical heat flux characteristics of water flowing in a uniformly heated single microtube. Stainless steel test tubes of 0.31mm and 0.49mm inner diameters were heated ohmically and the heated length was 200 times the inner diameter. Constant mass flux conditions were achieved by suppressing backflow with a pressure drop element. The mass flux and inlet subcooling was varied between 100-1000 kg/(ms) and 5-77 K respectively. Results showed a strong dependency on inlet subcooling over certain flow rates, and the threshold differed according to the tube inner diameter.

E211 Critical heat flux in microtubes at high exit quality conditions