The enhancement of the critical heat flux by the attachment of porous plates on the heated surface is investigated experimentally under the saturated pool boiling conditions. In the case that a honeycomb porous plate is applied, the CHF increases up to 2.51 MW/m2, which is approximately 2.5 times that of a plain surface (1.01 MW/m2). It is found that the keys for the enhancement of the CHF are the automatic liquid supply due to capillary action and the reduction of the vapor counterflow resistance due to separation of liquid and vapor flow by the honeycomb porous structure. A simplified one-dimensional capillary-limit model, in which the pressure drop due to liquid and vapor flow is balanced by capillary force, is applied to predict the CHF. The calculated results are compared with the observed ones.
|Number of pages
|Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
|Published - Oct 2009
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering