Abstract
A few decades ago, the product development process was just based on a trial and error procedure, and the designer's experience. The need for a new way to design and manufacture more economical and sustainable products corroborates increasingly to a new vision of how to create new products for the benefit of society. Modern numerical tools allow greater knowledge about the physical phenomena involved in engineering problems and enable cost reduction with trials and time of manufacture and projection. Among the equipment that can be mentioned where numerical simulation is used, can be found heat exchangers, which are capable of accomplishing the heat transfer between two fluid medias with different temperatures. Within the range of existing exchangers, this work will address a compact model with louvered fins, widely used in the automotive and aerospace industries, mainly due to their high thermal exchange surface vs occupied volume ratio. The heat exchanger surface is analised using computational fluid dynamics tecniques disposable in the commercial code ANSYS CFX14® to reproduce the flow at service condition. Genetic optimization routines are used to increase the performance of heat exchanger. As a result, a heat transfer surface is obtained with about a 25% better performance according to the selected objective function. The dimensionless factor of the convective heat transfer coefficient (Colburn factor, j) and the friction factor (Fanning factor, f) used in (Wang et al.,1998), are employed for simulation. Experimental data are also used for validation.
Highlights
The design of more efficient thermal equipment with lower cost is one of the goals of modern engineering
The use of numerical simulation and optimization algorithms become tools to achieve results, change the initial prototypes by virtual tests, reducing costs associated with the reduction of experimental trials (Herckert et al, 2004)
In the present work a compact heat exchanger with louvered fins is analyzed by reproducing the flow at service condition using computational tools
Summary
The design of more efficient thermal equipment with lower cost is one of the goals of modern engineering. In the present work a compact heat exchanger with louvered fins is analyzed by reproducing the flow at service condition using computational tools. These fins are fabricated by the stamping of sheet metal and the bending of the cut region, allowing a massflow between layers and increasing the heat transfer rate due to their influence on the flow and temperature behavior. CP - Specific Heat DC - Internal diameter F1 , F2 , F3 , F4 , F5 , F6 , F7 , F8 , F9 – Correlation parameters for the Fanning factor fhigh - Fanning factor for a high Reynolds number flow - Fanning factor for a low Reynolds number Fd- Fin depth Fp- Fin Pitch G– Objective function. Pl - Longitudinal tube Pitch Pt- Transverse tube Pitch T, t- Temperature u- Longitudinal Velocity Umax- Maximum velocity in vertical section with smaller area u* - Fluid friction velocity near the wall x -Variable in x direction y - Distance to the wall y+ - Dimensionless distance to the wall
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