Effect of flow diverters on free convection heat transfer from a pair of vertical arrays of isothermal cylinders
| Autor: | Hossein Rezvantalab, Tooraj Yousefi, Mehdi Ashjaee, Osameh Ghazian |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Fluid Flow and Transfer Processes
Natural convection Materials science business.industry Mechanical Engineering General Chemical Engineering Aerospace Engineering Laminar flow Rayleigh number Mechanics Nusselt number Isothermal process Cylinder (engine) law.invention Physics::Fluid Dynamics symbols.namesake Optics Nuclear Energy and Engineering law Heat transfer symbols Rayleigh scattering business |
| Zdroj: | Experimental Thermal and Fluid Science. 35:1398-1408 |
| ISSN: | 0894-1777 |
| DOI: | 10.1016/j.expthermflusci.2011.05.008 |
| Popis: | Laminar free convection heat transfer from two vertical arrays of five isothermal cylinders separated by flow diverters is studied experimentally using a Mach–Zehnder interferometer. The width of flow diverters is kept constant to two-cylinder diameters and the cylinders vertical center-to-center spacing is equal to three-cylinder diameter. Effect of the ratio of the horizontal spacing between two cylinder arrays to their diameter ( S h / D ) on heat transfer from the cylinders is investigated for various Rayleigh numbers. The experiments are performed for S h / D = 2–4, and the Rayleigh number based on the cylinder diameter ranging from 10 3 to 3 × 10 3 . It is observed that for small S h / D ratios, the flow diverters have a negative effect on the total rate of heat transfer from the arrays; while by increasing the horizontal center to center spacing, they tend to enhance the overall cooling rate of the array. Moreover, increasing Ra and S h / D generally results in a higher average Nusselt number for each cylinder in the array. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect