TY  - JOUR
TT  - EXPERIMENTAL VALIDATION OF LMTD METHOD FOR MICROSCALE HEAT TRANSFER
AU  - Parlak, Nezaket
PY  - 2017
DA  - April
DO  - 10.18186/thermal.298619
JF  - Journal of Thermal Engineering
PB  - Yildiz Technical University
WT  - DergiPark
SN  - 2148-7847
SP  - 1181
EP  - 1195
VL  - 3
IS  - 2
KW  - Microscale flow and heat transfer
KW  - LMTD method
KW  - Scaling effects
N2  - The single phase fluid flow and heattransfer characteristic has been investigated experimentally. Experiments wereconducted to cover transition zone for the Reynolds numbers ranging from 100 to4800 by fused silica and stainless steel microtubes having diameters of 103-180µm. The applicability of the Logarithmic Mean Temperature Difference (LMTD)method was revealed and an experimental method was developed to calculate theheat transfer coefficient. Moreover the scaling effects in micro scale such asaxial conduction, viscous heating and entrance effects were discussed. The heattransfer coefficients were compared with data obtained by the correlationsavailable in the literature in the study. The Nusselt numbers of microtubeflows do not accord with the conventional results when the Reynolds number waslower than 1000. After that, the Nusselt number approaches the conventionaltheory prediction. On the aspect of fluid characteristics, the friction factorwas well predicted with conventional theory and the conventional frictionprediction was valid for water flow through microtube with a relative surfaceroughness less than about 4 %.
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UR  - https://doi.org/10.18186/thermal.298619
L1  - https://dergipark.org.tr/en/download/article-file/284408
ER  -