Sample interview questions: How would you approach designing an efficient heat exchanger using fluid dynamics principles?
Sample answer:
1. Determine Heat Transfer Requirements:
– Define the desired heat transfer rate, inlet and outlet temperatures of both fluids.
2. Select Fluid Types:
– Consider fluids with high thermal conductivity, low viscosity, and a wide operating temperature range.
3. Optimize Flow Geometry:
– Use CFD (Computational Fluid Dynamics) simulations or empirical correlations to determine an optimal flow pattern that balances pressure drop and heat transfer.
– Optimize the geometry and spacing of heat transfer surfaces for maximum surface area and fluid mixing.
4. Choose Heat Transfer Enhancement Techniques:
– Employ extended surfaces (fins, tubes, plates) to increase heat transfer area.
– Utilize turbulators or fluid additives to promote flow mixing and break up boundary layers.
5. Minimize Pressure Drop:
– Streamline the flow path to reduce friction losses.
– Optimize the shape and orientation of heat transfer surfaces to minimize flow resistance.
6. Consider Fouling and Corrosion:
– Select materials that resist fouling a… Read full answer
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