Channel Flow Direction Research Articles

Optimizing water intake angle by flow separation analysis

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A monolithic fabrication process for a micro-flow heat transfer channel suspended over an air layer with arrays of micro-sensors and heaters

The objective of this work is to develop a surface micro-machining process that can be used to fabricate a heated micro-channel integrated with an array of both the pressure and the temperature sensors along the channel. With an air layer made underneath the channel for the purpose of insulation, this micro-channel can provide gas flow with measurement of both the local pressure and temperature distribution along the channel flow direction. This heated small size micro-channel can be used to study the channel flow and heat transfer process at the rarefied condition. The entire fabrication process is very complicated which has used a total of 21 photo masks and taken more than 320 times of fabrication procedures. Therefore, the channel has to be carefully designed and preliminary fabrication test has to be done before starting the complete fabrication process. The design consideration and fabrication procedures will be presented. Some of the difficulties encountered during the fabrication process will be discussed.

Inverse analysis for estimating the timewise and spacewise variation of the wall heat flux in a parallel plate channel

Solves the inverse problem of estimating the wall heat flux in a parallel plate channel, by using the conjugate gradient method with adjoint equation. The unknown heat flux is supposed to vary in time and along the channel flow direction. Examines the accuracy of the present function estimation approach, by using transient simulated measurements of several sensors located inside the channel. The inverse problem is solved for different functional forms of the unknown wall heat flux, including those containing sharp corners and discontinuities, which are the most difficult to be recovered by an inverse analysis. Addresses the effects on the inverse problem solution of the number of sensors, as well as their locations.