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CNRS 
HEAT TRANSFER MODIFICATION ON NATURAL CONVECTION FLOWS BY USING A LOCALIZED THERMAL ACTION
CNRS - ENSMA - University of Poitiers, Poitiers
Institut PPRIME - UPR CNRS 3346
Aeronautical Engineering Fluid mechanics Physics (Other) 
Full Description:

Abstract: The chaotic behavior of natural convection flows makes possible the use of instability to modify heat transfer. The key idea is to perturb the boundary layers by thermal perturbations in order to obtain resonant phenomena and thus amplify the effects of these disturbances.

Keywords: Experimental convection, buoyant flows, turbulence, instabilities.

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Full description:

Improving the energy performance of a cabin (transport, residential, tertiary, etc.) is a major concern for its impact on consumption and greenhouse gas (GHG) emissions. The manipulation of natural convection flows (imortant energy transfer mechanism in these devices) in order to optimize and control of heat transfers appears therefore of great interest. Previous works in the laboratory (Skurtys PhD thesis or Thomas PhD thesis, for example) have demonstrated the feasibility and pertinence of such an approach. The chaotic nature of natural convection phenomenon makes these flows very sensitive to disturbances. This aspect must be exploited through laboratory demonstrators.


The candidate will work to examine the response to a given excitation and optimize it in terms of energy efficiency. This is essentially experimental study to be conducted on two reference test benches (differentially heated cavities or DHC) available in the laboratory: the first one is of small size (50-cm-DHC) allowing the study of the first flow bifurcations. The second one is a large and unique DHC (4m-high-DHC) dedicated to the study of natural convection flows in turbulent regime on the scale of an actual cabin.

In this study, the fluid (air) is locally disturbed by controlled thermal excitation amplitude and frequency. The problem of optimal positioning of the disturbance and the analysis of the response aiming at actively controlling heat transfers will be investigated based on the expertise of the team especially on thermal metrology (micro-thermocouples, micro-flow meters, LDV and PIV). It could be combined by numerical simulations (Navier-Stokes), parametric sensitivity studies, carried out in collaboration with longstanding academic partners.



Posted on: 30 January 2015Deadline to apply: 20 March 2015Start Date: 01 October 2015 Duration: 36 months
The Fund category is Public Funding - Region (State) and the salary is 20-25k€ annual gross
Doctoral School is Materials, mechanic, energetic and aeronautic science and engineering (SI-MMEA) in the Poitou-Charentes Region.

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