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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/6759

Title: Non-equilibrium heat transfer in acceleration and pressure-driven Poiseuille flows: A comparative study
Authors: John, B
Gu, XJ
Emerson, DR
3rd Micro and Nano Flows Conference (MNF2011)
Keywords: Non-equilibrium
Poiseuille flow
Heat flow rate
Publication Date: 2011
Publisher: Brunel University
Citation: 3rd Micro and Nano Flows Conference, Thessaloniki, Greece, 22-24 August 2011
Abstract: A comparison of non-equilibrium flow and heat transfer characteristics between the acceleration-driven and pressure-driven Poiseuille flow is made with the aid of the direct simulation Monte Carlo method. In particular we study thermal characteristics like temperature and heat flux profiles, heat flow rates and net heat flow directions for both cases. Our study shows several interesting similarities and contrarieties. Non-equilibrium heat flow phenomenon like a bimodal tangential heat flux profile and a heat flow rate maximum at an intermediate Knudsen number is observed for the case of the pressure-driven flow. For both acceleration and pressure-driven cases, a two-way heat flow is observed in the slip and early transition regime, whereas heat flow is unidirectional in the upper transition regime and beyond. For the pressure-driven Poiseuille flow, the net heat flow is in the opposite direction of mass flow for the entire range of Knudsen number. In the case of the acceleration driven flow, however, the heat flow direction reverses and becomes in the direction of mass flow in the upper transition regime and beyond.
Description: This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, Aristotle University of Thessaloniki, University of Thessaly, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute.
Sponsorship: The Engineering and Physical Sciences Research Council (EPSRC) supporting the Collaborative Computational Project 12 (CCP12).
URI: http://bura.brunel.ac.uk/handle/2438/6759
Appears in Collections:Brunel Institute for Bioengineering (BIB)
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