LES of heat tranfer in corrugated channels

U velocity contours
U velocity contours, Re=10 000

PhD student: Maryam Mirzaei
Supervisor: Lars Davidson
Co-supervisor: Fredrik Innings, Tetra Pak
Cooperation: Prof. Ahmad Sohankar, Isfahan university of technology, Iran
Sponsors: Ministry of Science, Technology and Research of Iran
Publications: [-]
Start of project: September 2011
End of project: -

Today heat Exchangers are widely used as an important component in heat transfer area. Depending on the application of heat exchangers in the industry, several methods are used for increasing the heat transfer with a reasonable pressure drop. One of these methods is using the corrugated tubes which increase the amount of heat transfer by producing recirculating flow. The recirculation regions increase the turbulence in flow, decrease the thickness of the thermal boundary layer and increase the heat transfer.

This project is carried out in corporation with Tetra Pak. The main objective of the project is to optimize the heat transfer and pressure drop in corrugated tubes and shells. Since the geometrical parameters of the tubes have an crucial role in the performance of the heat exchangers, the objective is to find an efficient geometrical form of the corrugations and to increase our understandning of the critical parameters for high heat transfer and low pressure drop. Both Large Eddy Simulation (LES) and Direct Numerical Simulations (DNS) are used for studying the fluid flow and heat transfer. Our predictions will initially be compared with experimental results carried out at Tetra Pak; in general, however, we believe that our our LES and DNS will be as accurate as experimental data.

In order to simplify the simulations, we will initially study the flow in a plane channel where the lower wall is corrugated, see the figure above. The advantage of a plane configuration (channel) to a circular one (pipe) is that the extent of the domain in the spanwise direction is smaller than the perimeter of the pipe. Hence a smaller mesh can be used.

The CALC code is used for both LES and DNS simulations.

Corrugated pipe

Smooth and corrugated pipes





This page, LES of heat tranfer in corrugated channels, should be part of a frames system at www.tfd.chalmers.se/~lada/projects/proind.html
Ingalena Ljungström