Scale effects on hydrodynamics and heat transfer in two-dimensional mini and microchannels
By P. Gao, S. Person, M. Favre‐Marinet. 2002
163 citations recorded by the source corpus.
The present paper is devoted to experimental investigations of the flow and the associated heat transfer in two-dimensional microchannels. Scaling laws pertaining to the hydrodynamics and heat transfer in microchannels are not yet clearly established. The published results are affected by a significant scatter, owing to the various conditions used in the experiments, and, most likely, owing to the difficulty of measurements at micronic scales. The present facility was designed to modify easily the channel height e. It was then possible to investigate hydrodynamics and heat transfer in channels of height ranging from 1 mm, which corresponds to conventional size, up to 0.1 mm, where size effects are expected. Size effects were therefore tested in the same set-up and with the same channel walls for all the experiments, which were carried out with demineralized water. Measurements of the overall friction coefficient and of local Nusselt numbers show that the classical laws of hydrodynamics and heat transfer are verified for e>0.4 mm. For lower values of e, a significant decrease of the Nusselt number is observed whereas the Poiseuille number keeps the conventional value of laminar developed flow. The transition to turbulence is not affected by the channel size.
Subfields: Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/984b04384eb4869835084344eb425dc51ab2d3fa
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In Mechanical Engineering
- E. Pogrebnyak
- A. Mosyak
- Gad Hetsroni
- G. Gamrat
- D. Asendrych
- M. Favre‐Marinet
- Mohamed M. A. Abdelgawad
- Ibrahim Hassan
Citations in the corpus
- MICROCHANNEL HEAT SINKS: AN OVERVIEW OF THE STATE-OF-THE-ART (2004, background): “[9] also studied the transition Reynolds number in microchannels by investigating how it varies with the channel height.”
- Conduction and entrance effects on laminar liquid flow and heat transfer in rectangular microchannels (2005, methodology): “This explains why a close agreement was found in the experiment [6] for the electric power dissipated in the test section and the total rate of enthalpy convected by the stream across the channel, which was determined with the fluid temperatures in the inlet/outlet sumps (Fig.”
- Heat transfer in micro-channels: Comparison of experiments with theory and numerical results (2005, methodology): “[18]: 1—Brass block, 2— micro-channel, 3—heater.”