Effect of oversize in wire-screen matrix to the matrix-holding tube on regenerator thermal performance
Journal
Cryogenics
Journal Volume
36
Journal Issue
5
Pages
365-372
Date Issued
1996
Author(s)
Abstract
A typical regenerator in a cryocooler is usually made by packing hundreds of finemesh but oversize wire screens into a small circular tube to provide better thermal performance. By the use of the oversize wire screens, the flow leakage around the inner circumference of the tube is significantly reduced. The oversize in the wire screen is the difference between the diameter of the wire screen and the inner diameter of the tube. In the present study a single-blow test method was used to investigate the effect of oversize on the thermal performance of regenerators. Heat transfer and pressure measurements were performed on three test regenerators. The value in oversize ranged from 0.05 mm to 0.55 mm. The average heat transfer rate of regenerators increases with oversize of wire screens. In addition, empirical relations are provided for the Nusselt number and friction factor versus the Reynolds number for each test regenerator.
Subjects
Cryocoolers; Heat transfer measurements; Regenerators
SDGs
Other Subjects
Calculations; Friction; Heat transfer; Nusselt number; Pressure measurement; Reynolds number; Thermal variables measurement; Tubes (components); Cryocoolers; Heat transfer rate; Oversize wire screen matrix; Single blow test method; Regenerators
Type
journal article