ABSTRACT
Boiling provides an efficient heat transfer mechanism for applications such as the cooling of electric components, metal processing, and fusion components, where heat transfer coefficients commonly exceed 10,000 W/(m2K) at relatively high heat fluxes. The critical heat flux (CHF), which defines the upper limit of the efficient range of boiling heat transfer, limits the maximum heat flux that may be dissipated from the components. For the planar free surface jet, the flow characteristics are similar to that of a circular jet, except for a change in the liquid film thickness. Impinging jet system is capable of cooling at extremely high heat fluxes, more than 10 MW/m2. Effects of system parameters on CHF for some jet configurations are studied extensively, and specific correlations for CHF are available for a number of these configurations with high accuracy. The CHF for subcooled jets approaches that for the corresponding saturated conditions with decreasing subcooling.
