AN IMPROVED MODEL FOR THE SINGLE-BLOW MEASUREMENT INCLUDING THE NON-ADIABATIC SIDE WALL EFFECT

摘要

The present study proposes an improved model for the single-blow technique which is commonly used to measure the thermal performance of a cryocooler's regenerator matrix. The improvements in the present model include the heat nux from the fluid into the side wad and the axial conduction of the wire-screen matrix and side wall as a suddenly heated fluid passes through the wire-screen matrix. Numerical results obtained from the present model are compared with both the analytic results that exclude the axial conduction and the predicted results of a prior study that neglect the heat flux into the side wall. Results are also presented to illustrate the effect of the heat capacity of the side wall, the heat nux into the side wall, and the axial conduction on both the exit fluid temperature response and the NTU value. [References: 9]