Heat transfer for water flow in trapezoidal silicon microchannels

✍ Scribed by Weilin Qu; Gh.Mohiuddin Mala; Dongqing Li

• Book ID: 108322534
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 412 KB
• Volume: 43
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/s0017-9310(00)00045-4

✦ Synopsis

Experiments were conducted to investigate heat transfer characteristics of water ¯owing through trapezoidal silicon microchannels with a hydraulic diameter ranging from 62 to 169 mm. A numerical analysis was also carried out by solving a conjugate heat transfer problem involving simultaneous determination of the temperature ®eld in both the solid and the ¯uid regions. The experimental results were compared with the numerical predictions and a signi®cant dierence was found. The comparison results indicated that the experimentally determined Nusselt number is much lower than that given by the numerical analysis. The measured lower Nusselt numbers may be due to the eects of surface roughness of the microchannel walls. Based on a roughness-viscosity model established in our previous work, a modi®ed relation which accounts for the roughness-viscosity eects was proposed to interpret the experimental results.