The paper presents a method for determining the heat transfer coefficient during boiling in a cooling fluid flow through a rectangular minichannel heated asymmetrically. Local values of the heat transfer coefficient were determined by solving a two-dimensional inverse heat conduction problem. This problem was solved using Beck’s method (sensitivity coefficient method) in combination with the Trefftz function method.By applying Beck’s method, the inverse problem was decomposed into two direct problems, and then the solutions to these problems were approximated using Trefftz functions. The results obtained from a sample experiment, in which liquid crystal thermography is used to measure the temperature of the heating surface, are presented and analyzed.
THE APPLICATION OF SENSITIVITY COEFFICIENT METHOD WITH THE USE OF TREFFTZ FUNCTIONS IN INVESTIGATIONS INTO HEAT TRANSFER IN A MINICHANNEL
The paper presents the method for determination of boiling heat transfer coefficient in cooling liquid flow in a rectangular minichannel with asymmetric heating. Local values of the heat transfer coefficient have been determined following the solution of the two-dimensional reverse heat transfer problem. This problem has been solved with Beck`s method (sensitivity coefficients) in combination with Trefftz functions. Thanks to the application of Beck’s method, the reverse problem has been decomposed into two simple problems, whose solutions have been approximated with Trefftz functions. The results obtained from a sample experiment have been presented and analysed, the experiment relying on liquid crystal thermography for the measurement of the heating surface temperature. (…)
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Source: Logistyka Magazine