Numerical simulation of the ultra-low-temperature effect on the waterjet focusing tubes

Waterjet cutting is a universal method in machining the structural materials widely used in various industries. The study of promising modifications in the ultra-jet machining technology to increase its efficiency is a pressing problem. The paper studies a possibility of cooling the focusing tube in the ultra-jet machining to increase erosion resistance of the jet-forming elements by forming a protective ice film to preserve the tube. It proposes a promising design of the double-circuit spiral heat exchanger to ensure better heat removal from the waterjet system elements subject to the erosive wear. The boundary value problem of the cryogenic heat transfer and heat balance is considered. Mathematical simulation results of focusing the tube cryogenic cooling using the finite element method in the specialized software environment of two different heat exchanger designs are presented. Temperature gradient of the focusing tube material is noticeably improved in comparison with the heat exchanger configuration analog. Temperature difference in the focusing tube material is reduced significantly compared to the previous heat exchanger design.
EDN: BLQZVW, https://elibrary/blqzvw

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