A new cooling scheme is proposed where the primary working fluid flowing through a micro-channel heat sink is pre-cooled to low temperature using an indirect refrigeration cooling system. Cooling performance was explored using HFE 7100 as working fluid and four different micro-channel sizes. High-speed video imaging was employed to help explain the complex interrelated influences of hydraulic d...

A high flux electronic chip was numerically and experimentally simulated to investigate pool boiling capabilities of enhanced metallic surface attachments built upon a 12.7 x 12.7 mm base area. It is shown how experimental nucleate boiling data for aflat chip and for chips with low-profile microstructures can be used as input boundary conditions in the numerical prediction of boiling performanc...

The spacer grid has a significant impact on the thermal-hydraulic characteristics of rod bundle channel, which directly determines possibility boiling crisis. multi-phase flow model coupling is proposed to acquire secondary and void fraction for subcooled in fuel assembly. Compared with experimental data, RNG k–ε turbulence selected current research. In addition, parameters 5 × are studied focu...

Abstract Heat transfer from inner surface of a vertical heated pipe to subcooled or saturated liquid hydrogen flowing upward was measured for quasi-steadily increasing heat input up fully developed film boiling regime and decreasing the through regime. The experiments were carried out at inlet pressures 400, 700 1100 kPa subcoolings 0 K 11 K. Three test heaters made SS310S with diameters 6 8 mm...

The effect of non-condensible gas on subcooled water critical flow phenomena in a safety valve is investigated experimentally at various subcoolings and disk lifts. In the experiment, the flow rate of non-condensible gas is controlled between 0 to 2 m/hr about 11 bar after the subcooled water critical condition is established at the throat of a safety valve. The critical pressure ratio with non...