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An Experimental Study and Modelling of Roughness Effects on Laminar Flow in Microchannels by G. GAMRAT; M. FAVRE-MARINET; S. LE PERSON; R. BAVIÈRE; F. AYELA is a Engineering article available to read on EtoBox.

What is An Experimental Study and Modelling of Roughness Effects on Laminar Flow in Microchannels about?

Three different approaches were used in the present study to predict the influence of roughness on laminar flow in microchannels. Experimental investigations were conducted with rough microchannels 100 to 300μm in height (__H__). The pressure drop was measured in test-sections prepared with well-controlled wall roughness (periodically distributed blocks, relative roughness __k__\* =__k__/0.5__H__≈0.15) and in test-sections with randomly distributed particles anchored on the channel walls (__k__\* ≈0.04–0.13). Three-dimensional numerical simulations were conducted with the same geometry as in the test-section with periodical roughness (wavelength __L__). A one-dimensional model (RLM model) was also developed on the basis of a discrete-element approach and the volume-averaging technique. The numerical simulations, the rough layer model and the experiments agree to show that the Poiseuille number __Po__ increases with the relative roughness and is independent of __Re__ in the laminar regime (__Re__ 0.2, where __c__ decreases with the porosity ε.

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Author

G. GAMRAT; M. FAVRE-MARINET; S. LE PERSON; R. BAVIÈRE; F. AYELA

Publisher

Cambridge University Press (CUP)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)