This study aims to investigate the significance of conjugate
heat transfer in the microscale within the slip regime. As
within the slip regime the continuum assumption is invalid due
to presence of rarefaction effects, the Lattice Boltzmann
method (LBM) is employed to overcome the limitations of
Navier Stokes based solutions in this regime. We have
constructed and compared two case models in which a fluid of
higher temperature enters a microchannel. The conditions are
set to obtain Knudsen numbers which result in the slip regime
being dominant. To investigate the effect of conjugate heat
transfer, the two models differed in the aspect that one model
did not incorporate conjugate heat transfer and while the
other did. The numerical calculation was validated by
comparing the velocity profile results to exact theoretical
approximations and was found to agree well. The results of
comparison of models Case I and Case 2 have shown that
temperature profile is affected significantly by conjugate heat
transfer. The conjugate heat transfer at the microchannel wall
(Case 1) was shown to maintain the initial temperature of fluid
longer than compared to a purely isothermal wall (Case 2),
thus signifying the importance of the consideration of
conjugate heat transfer effects in microfluid models. We have
implemented GPU based parallel processing to reduce
computation time. The result of the incorporation of GPU
processing was found to increase processing speed up to 15
times.