AND FLOW FRICTION CHARACTERISTICS OF PERFORATED MATERIAL FOR COMPACT HEAT EXCHANGER SURFACES

from the United States Naval Postgraduate School The transient testing technique for the determination of heat trans-fer characteristics of a porous medium has been known since 1929. It requires a good deal of care and one of the important restrictions is a step change in temperature must be applied to the medium at the beginning of a test run. This thesis involves the design, test and evaluation of an experimental set-up that utilizes an "integral heater " to accomplish the step change in temperature. In addition, there is presented heat transfer and flow friction characteristics for a 20 ° skew matrix con-structed from perforated nickel material. This data is compared to a 20 ° skew matrix made from stainless steel material that has been pre-viously reported by C. P. Howard. Also, data is presented for two "paral-lel plate " matrices, one constructed from brass sheet, the other fro