Existing researches on heat transfer enhancement show that the improvement of thermal performance is always accompanied by an increase in pressure drop, which seriously affects the practical application. With the implementation of the various drag reduction methods, the researches and applications of DR methods in heat transfer enhancement have attracted more and more attention. The research on drag reduction by introducing superhydrophobic surface shows that the slip regime plays an important role in drag reduction. This study investigated thermally developing laminar liquid flow and heat transfer in microtubes at slip regime numerically, with hydraulic diameter of 200 mm, constant heat flux of 10^5^ W/m^2^, *Re* of 100 and slip length *l*~s~ ranging from 2 mm to 20 mm. The dimensionless thermal entrance length increases with the increasing slip length. The results show that microtube with slip boundary has the larger lacal Nusselt number and a longer thermal entrance length compared with available experimental data of no-slip boundary. Local and average Nusselt numbers are obtained, and start high and rapidly decrease with the increasing dimensionless axial distance. Nusselt number increases with the increasing slip length. The correlations of the dimensionless thermal entrance length and local Nusselt number are proposed with predicted deviations of no more than 0.12% and 1.53% respectively, which can be used to optimize microchannel heat sinks.


Thermally Developing Laminar Liquid Flow and Heat Transfer in Microtubes at Slip Regime

Division / Sponsors: 
Heat Transfer Division (HTD), Fluids Engineering Division (FED)

Heat Transfer Summer Conference
Paper Proceedings: https://asmedigitalcollection.asme.org/HT/HT2020/volume/83709

18th International Conference on Nanochannels, Microchannels, and Minichannels
Paper Proceedings: https://asmedigitalcollection.asme.org/ICNMM/ICNMM2020/volume/83693

Fluids Engineering Division Summer Meeting
Paper Proceedings: https://asmedigitalcollection.asme.org/FEDSM/FEDSM2020/volume/83716

HT-ICNMM2020 - Virtual Conference, SHTC - Virtual Conference, FEDSM2020 - Virtual Conference

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