An Experimental Investigation of Heat Transfer From a Spray Cooled Isothermal Cylinder

Abstract

The local and overall heat transfer around a horizontal, isothermal, circular cylinder exposed to a crossflow of a water-in-air spray has been determined experimentally. The investigation involved a closed loop wind tunnel in which a spray nozzle and an electrically heated test cylinder were located. The rate of heat transfer was measured for free stream air Reynolds numbers of 30,000, 75,000, and 118,000; the water-to-air mass flow ratios varied from 0 to 0.13. Results indicate that two-component heat transfer coefficients may be thirty times those of single-component (air) flow.