| 论文简介 |
The critical heat flux (CHF) for flow boiling of cyclohexane was experimentally investigated in electrically
heated minichannels with inside diameters of (1 and 2) mm, and heated lengths of (360 and 710) mm at
mass velocities ranging from (318 to 1274) kg/m2 s, heat fluxes from (50 to 1000) kW/m2, and pressures
of (1.0, 2.0, 3.0) MPa. Cyclohexane entered the test channel at ambient temperature of about 20 C, equivalent
to high subcooling of (162.1, 206.4 and 236.3) C at (1.0, 2.0 and 3.0) MPa respectively. The critical
vapor qualities ranged from 1.35 to 0.83. Results indicated that CHF of cyclohexane increased with
increasing mass velocity and decreasing heated length. Reducing channel diameter at the same lengthto-
diameter ratio was proved to have no effects on CHF values of cyclohexane at the evaluated conditions.
CHF mildly increased with an increase in pressure at higher mass velocities, but critical vapor quality
always decreased with the increasing pressure. Experimental CHF data were compared with the Katto–
Ohno (1984) correlation and Shah (1987) correlation. Good agreements were achieved between the
experimental data and those predicted with most deviations not exceeding 30%. A corrected Katto–Ohno
CHF correlation is developed to fit the current experimental data. Excellent agreement was obtained with
all the deviations (whatever of saturation CHF or subcooled CHF) in the range of ±10% with RMS error of
5.35%. |
(创新港)
