Abstract
Dissipative particle dynamics is a particle-based mesoscopic simulation method. Classic dissipative particle dynamics cannot be used to simulate heat transfer in fluids since the total energy of the system is not conserved. In this article, two-dimensional unsteady heat conduction is first investigated using dissipative particle dynamics with energy conservation. The energy conservative dissipative particle dynamics results are compared with the FLUENT simulation data, and it demonstrates that they are in good agreement with each other. Then, forced convection heat transfers in microchannel of the same wall temperature and different wall temperatures are simulated, respectively, by using periodic boundary condition of dimensionless temperature. The results show that the velocity, temperature, and dimensionless temperature distributions are consistent with theoretical results. Finally, we give a qualitative analysis about the applicability of the energy conservative dissipative particle dynamics approach in simulating flow and heat transfer in rough microchannel.
Highlights
In recent years, with the rapid development of microelectro mechanical systems (MEMS), the demand for probing the mechanism of the microscale flow and heat transfer problems is increased, in which the Knudsen number is probably larger or equal to unity
Brownian dynamics simulations (BDS), lattice gas automata (LGA), and lattice Boltzmann method (LBM) are mesoscale simulation methods, it is difficult for BDS to deal with a complex flow field and for LGA and LBM to cope with complex fluids.[3]
In section ‘‘Results and discussion,’’ we present the validation of the energy conservative dissipative particle dynamics (eDPD) model by the simulation of two-dimensional (2D) heat conduction
Summary
With the rapid development of microelectro mechanical systems (MEMS), the demand for probing the mechanism of the microscale flow and heat transfer problems is increased, in which the Knudsen number is probably larger or equal to unity. The results show that the forced, natural, and mixed convection flow and heat transfer in complex geometries are correctly predicted using eDPD. The eDPD was used to simulate fluid flow and forced convective heat transfer in microchannel. The energy equation (3) includes three parts, in which viscous heat flux qvi isc accounts for the viscous heating resulting from the dissipative interactions between the particles, collisional heat flux qci ond corresponds to the heat transfer resulting from a temperature difference, and random heat flux qriand takes into account the fluctuations due to random heat fluxes They are expressed as follows[12] qvi isc (
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