Development and design of cold heat exchanger of pulse tube cooler

During the past fifteen years, heat transfer in oscillating flows has become a subject of increasing interest in the engineering community. Applications of oscillating flows include, for example, cooling electric equipment or alternative, environmentally safe refrigeration technologies, such as pulse tubes or Stirling refrigerators. Important components of these refrigerators are their heat exchangers. In such devices, the working fluid is subject to oscillatory forcing which is a key part of the process, as opposed to situations where oscillations are generated with the aim to enhance heat transfer. Heat transfer in oscillating, and often compressible flow, has not yet been completely understood, and the lack of design methodologies for heat exchangers in such flow is one reason that efficiencies of these devices are limited. A practical design method of a cold heat exchanger was developed in this paper. The influence of the working gas oscillation on heat transfer was considered in this method. The design parameters related to gas oscillation can be calculated using known methods.