Effect of entrance condition on frictional losses and transition to turbulence
Abstract
In studying the fluid flow and heat transfer in
microchannels, various claims have been made regarding
transition at Reynolds numbers significantly below 2300. As a
first step in identifying the reasons for such early transition, the
effect of entrance geometry on the pressure drop and transition
to turbulence is studied experimentally in a conventional
channel of 1.9 cm inner diameter. Four types of entrance
conditions have been studied with flow of oil in a closed loop.
The experimental results show the effect of entrance conditions
on local friction factor, hydrodynamic developing length, and
transition Reynolds number. The study will be extended to
microchannels in the future.
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