Abstract
Laminar flow and heat transfer characteristic in a square channel heat exchanger installed with inclined wavy surface are investigated numerically. The inclined wavy surface is designed with the main the aim to help the installation, production and maintenance when using the inclined wavy surface in the heat exchanger. The finite volume method with SIMPLE algorithm is selected to solve the present problem. The effects of flow attack angle (α = 15°-60°) and Reynolds number (Re = 100-1200) on heat transfer, friction loss and thermal performance are considered. The numerical model is validated with the smooth channel. The grid independence of the computational domain is checked. The numerical results show that the heat transfer enhancement is around 1.9-7.5 times above the smooth channel. The optimum thermal performance is found at the flow attack angle of 45° around 2.35 at Re = 1200.
Highlights
The vortex flow, swirling flow and thermal boundary layer disturbance are the mechanisms when installed the vortex generators in the heat exchanger
The flow topology in the square channel heat exchanger installed with inclined wavy surface is presented with tangential velocity vector in transverse planes and longitudinal vortex flow, while the heat transfer mechanism is plotted with temperature distributions in transverse planes and local Nusselt number distributions on the channel walls
Performance assessments in the square channel heat exchanger inserted with various flow attack angle of the inclined wavy surface are reported in terms of Nusselt number ratio (Nu/Nu0), friction factor ratio (f/f0) and Thermal Enhancement Factor (TEF)
Summary
The vortex flow, swirling flow and thermal boundary layer disturbance are the mechanisms when installed the vortex generators in the heat exchanger. The grid independences of the square channel heat exchanger installed with 45° inclined wavy surface for heat transfer and friction factor are presented in Fig. 3a and 3b, respectively. The flow topology in the square channel heat exchanger installed with inclined wavy surface is presented with tangential velocity vector in transverse planes and longitudinal vortex flow, while the heat transfer mechanism is plotted with temperature distributions in transverse planes and local Nusselt number distributions on the channel walls. Performance assessments in the square channel heat exchanger inserted with various flow attack angle of the inclined wavy surface are reported in terms of Nusselt number ratio (Nu/Nu0), friction factor ratio (f/f0) and Thermal Enhancement Factor (TEF).
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