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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2007.11
- 수록면
- 132 - 139 (8page)
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This research is an experimental and numerical investigation of heat transfer and fluid flow characteristics in separated, recirculated and reattached regions created by an axisymmetric abrupt expansion in a circular tube at a uniform wall temperature. The flow just upstream of the expansion was unheated and proved to be fully-developed at the entrance to the heated cavity region. Local heat transfer coefficients were measured using a balance-type isothermal heat flux gage. Measurements were made at a small to large diameter ratio of d/D = 0.4 and over a range of downstream Reynolds numbers from Re_<SUB>D</SUB> = 4,300 to 44,500. Generally, for a diameter ratio of d/D = 0.4, the maximum Nusselt numbers downstream of an axisymmetric abrupt expansion at a uniform wall temperature are 4 to 5.6 times greater than the corresponding fully developed values for the range of Re_<SUB>D</SUB> investigated, and occur between 9 and 12 step heights from the expansion step. It is also worthy to note that Nusselt numbers in the comer region near the step of the abrupt expansion are up to 2 times greater than the fully-developed values and reach a minimum value at about 1 step height downstream of the expansion step, suggesting the possible existence of a secondary recirculation region in the extreme comer region. Numerical simulation was has been carried out by a two-equation turbulence model, incorporating effects from streamline curvature in the eddy viscosity and reducing turbulence production in a circular channel flow regions through the dissipation rate transport equation and the turbulent viscosity.
목차
Abstract
1. Introduction
2. Experimental apparatus and procedure
3. Numerical analysis
4. Results and discussion
5. Conclusions
6. References
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