By incorporating a capillary pump loop, a miniature steam ejector refrigeration system can be designed to effectively cool electronics. In this system, the primary flow accelerates in the ejector nozzle, leaving with supersonic speed and creating low pressure in the mixing chamber. This low pressure causes the secondary flow to be drawn into the mixing chamber from the evaporator due to the pressure difference. The reference paper “ Numerical Investigation of Miniature Ejector Refrigeration System Embedded with a Capillary Pump Loop “ is our valid guidance through the current CFD study.

Figure 1: Schematic of ejector system

Simulation Process

Ejector schematic is presented below as well as the reference paper. In the absence of exact dimensions, construction points are recognized using Plotdigitizer software. This study features from 57088 structured cells that are produced using ANSYS Meshing. Axisymmetric swirl can be used in the current simulation to model swirling flow patterns in cylindrical or symmetrically shaped systems. The ideal-gas assumption of water vapor provides preliminaries to follow the compressibility theory.

Post-processing

The results from the simulation of the miniature steam ejector show some really interesting stuff. The temperature contour reveals a big drop in temperature in the ejector’s narrowest point, likely due to the steam rapidly expanding as it moves through the nozzle. As the steam continues downstream, the temperature quickly goes up. The velocity contour shows the fastest speeds in the narrowest point, with the flow slowing down as the temperature rises. This behavior is typical for a steam ejector, where the high-speed, low-pressure area in the narrowest point draws in the secondary fluid, and the slowdown allows for pressure recovery.