Abstract
Enhancement of pool boiling heat transfer can be attained with a number of passive and active techniques. The paper experimentally analyses the impact of laser treatment of the copper surfaces on pool boiling heat transfer of distilled water and ethyl alcohol. The samples were modified with a laser beam to produce longitudinal grooves of highly developed microstructures in the laser textured area. Specimens of different groove depths, groove widths and micro-fin widths were produced. The results indicate a significant influence of laser processing on heat flux dissipated from the surfaces and heat transfer enhancement for all the samples tested. The experimental results have been generalized in the form of a heat flux correlation based on a modified model of enhanced pool boiling heat transfer.
Highlights
Boiling heat transfer is a phase-change phenomenon, at which considerable heat fluxes are transferred at relatively small temperature differences
As a result of laser texturing the surface geometry and microgeometry of the samples were boiling heat flux wasof focused on the influence of theof groove depth, its width ason well as the boiling fin’s modified
Laser texturing provided considerable enhancement of pool boiling heat transfer, which was evidenced by a shiftprovided of the boiling curves enhancement for the laser processed samples the region of was low
Summary
Boiling heat transfer is a phase-change phenomenon, at which considerable heat fluxes are transferred at relatively small temperature differences. The critical heat flux enhancement of both laser textured specimens was almost 90%, while the heat transfer coefficient of over 115% compared to the smooth surface mostly due to increased active nucleation site density. Orzechowski [22] conducted experiments on a steel fin with longitudinal laser interfusions, located symmetrically across the specimen in the form of micro-fins Such a laser modified surface proved to enhance boiling especially at low heat flux values. The need for clarification of literature reports and for expanding the knowledge on pool boiling heat transfer on surfaces treated with the laser beam as well as generalizing the obtained results with a modified heat flux correlation have been the motivation behind the current experimental study.
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