Computational fluid dynamic modelling of enhanced heat transfer in tubes with inserts

Osley, William Gruffydd (2014). Computational fluid dynamic modelling of enhanced heat transfer in tubes with inserts. University of Birmingham. M.Phil.

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Abstract

Heat transfer is an important process in many different industrial processes including oil refming and energy generation. A shell and tube heat exchanger is one of the most common types of heat exchanger used to achieve effective heat transfer between two fluid streams. In order to improve such systems passive heat transfer enhancement techniques such as pipe inserts can be of use, especially at laminar or transitional fluid flow conditions.
This project uses Computational Fluid Dynamics (CFD) to investigate one type of pipe insert. Previous
experimental investigations of the insert found that it greatly increases heat transfer over a plain empty pipe. However the mechanisms of how and why the insert increases heat transfer are poorly understood. The aim of the project is to use CFD to investigate the mechanisms that occur inside a pipe with this type of insert, which lead to increased heat transfer.
The CFD and experimental data show good agreement, with the outlet temperature of the cases simulated being all within 3.5% difference. This means that the CFD simulations can be trusted when investigating the fluid flow patterns produced by the inserts. This revealed that the inserts create and increase the amount of recirculation from the pipe wall to the centre of the pipe when compared to a plain empty pipe. This explains why heat transfer increases by the use of this type of insert.

Type of Work:

Thesis (Masters by Research > M.Phil.)

Award Type:

Masters by Research > M.Phil.

Supervisor(s):