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The present study investigates the convective heat/mass transfer characteristics in wavy ducts of a primary surface heat exchanger. The effects of duct corrugation angle and flow velocity on the heat/mass transfer are investigated. Local heat/mass transfer coefficients on the corrugated duct sidewall are determined using a naphthalene sublimation technique. The flow visualization technique is used to understand the overall flow structures inside the duct. The wavy ducts with the corrugation angles of 145° and 130° are tested for the duct aspect ratio of 7.3. The Reynolds numbers, based on the duct hydraulic diameter, vary from 1,000 to 5,000. The results show that secondary vortex flow cells, called Taylor-Gortler vortices, exist periodically in the wavy duct. Therefore, non-uniform distributions of the heat/mass transfer coefficients are obtained on the duct walls. On the pressure-side wall, high heat/mass transfer regions appear due to the secondary vortex flows for both corrugation angles. On the suction-side wall, flow separation and reattachment appears near the comer at the Reynolds number of 2.500, however relatively high heat/mass transfer cell regions are observed on the suction-side wall at the highest Reynolds number of 5,000 for the corrugation angle of 145°. The wavy duct with the corrugation angle of 130° has the stronger strength of the secondary vortex cells resulting in higher heat/mass transfer rates on the duct wall because the sharp turn enhances the development of the secondary flow cells.

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ABSTRACT

1. 서론

2. 실험장치 및 방법

3. 실험결과 및 고찰

4. 결론

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UCI(KEPA) : I410-ECN-0101-2009-553-015400863