TY - GEN
T1 - The nusselt number in single-phase liquid flow forced convection in microchannels
AU - Lee, Man
AU - Lee, Yi Kuen
AU - Zohar, Yitshak
PY - 2007
Y1 - 2007
N2 - A thermal microsystem, integrated with pressure and temperature microsensors, is fabricated to study single-phase liquid flow forced convection under uniform heat flux boundary condition. Standard micromachining techniques were utilized in the fabrication of the integrated microsystem. Utilizing a waferbond-and-etch-back technology, the heat source, temperature and pressure sensors are separated from the fluid flow by a 1.5μm thick composite membrane; thus, allowing experimentally good control of the thermal boundary conditions. A threedimensional numerical simulation model has been constructed to investigate the heat flux distribution. The results show that upstream the cold working fluid absorbs heat, while downstream the warmer working fluid releases heat. The Nusselt number is calculated based on the computations, which are compared with analytical and experimental results. The wall Nusselt number in a microchannel can only be estimated by conventional analytical solution in a limited Reynolds number range. The estimated Nusselt number for forced convection is found to be highly dependent on the location of the temperature measurements.
AB - A thermal microsystem, integrated with pressure and temperature microsensors, is fabricated to study single-phase liquid flow forced convection under uniform heat flux boundary condition. Standard micromachining techniques were utilized in the fabrication of the integrated microsystem. Utilizing a waferbond-and-etch-back technology, the heat source, temperature and pressure sensors are separated from the fluid flow by a 1.5μm thick composite membrane; thus, allowing experimentally good control of the thermal boundary conditions. A threedimensional numerical simulation model has been constructed to investigate the heat flux distribution. The results show that upstream the cold working fluid absorbs heat, while downstream the warmer working fluid releases heat. The Nusselt number is calculated based on the computations, which are compared with analytical and experimental results. The wall Nusselt number in a microchannel can only be estimated by conventional analytical solution in a limited Reynolds number range. The estimated Nusselt number for forced convection is found to be highly dependent on the location of the temperature measurements.
KW - Forced convection
KW - Microchannel
KW - Nusselt number
KW - Single-phase liquid flow
UR - http://www.scopus.com/inward/record.url?scp=34548143351&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34548143351&partnerID=8YFLogxK
U2 - 10.1109/NEMS.2007.352067
DO - 10.1109/NEMS.2007.352067
M3 - Conference contribution
AN - SCOPUS:34548143351
SN - 1424406102
SN - 9781424406104
T3 - Proceedings of the 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE NEMS 2007
SP - 502
EP - 506
BT - Proceedings of the 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE NEMS 2007
T2 - 2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE NEMS 2007
Y2 - 16 January 2007 through 19 January 2007
ER -