Heatline analysis of heat recovery and thermal transport in materials confined within triangular cavities
| Autor: | Tanmay Basak, G. Aravind, S. Roy, A.R. Balakrishnan |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Heat transfer rate
Convection Materials science Convective heat transfer Heat exchangers Numerical visualization Drug products plants Enhanced heat transfer Thermodynamics Material processing Heat flows Triangular cavities Hot fluids Heat recovery ventilation Heat transfer Hot materials Heatlines High intensity Thermal transport Visualization Fluid Flow and Transfer Processes Fluids Natural convection Mechanical Engineering Rayleigh number Mechanics Local maximum Condensed Matter Physics Thermal conduction Convective heat Heat recovery Heat energy Waste heat Thermal management Heat flux Specific heat Flow measuring instruments |
| Zdroj: | International Journal of Heat and Mass Transfer. 53:3615-3628 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2010.03.028 |
| Popis: | Heat recovery from hot fluids in material processing industries is important for environmental and thermal management. Present work involves numerical visualization of heat flow in entrapped cavities filled with hot materials. The concept of heatline is used to visualize the heat energy trajectory. The system involves entrapped triangular cavities filled with hot fluid (Pr=. 0.015, 0.026, 0.7 and 1000). At low Rayleigh number (Ra), it is found that the heatlines are smooth and perfectly normal to the isotherms indicating the dominance of conduction for both the triangles. As Ra increases, flow slowly becomes convection dominant. Multiple heat flow circulations with high intensity are formed within the lower triangular domain especially for low Pr numbers, whereas, less intense convective heat flow circulations are observed for the upper triangle. Multiple circulations are absent for both the triangular domains involving fluids with higher Pr numbers. It is observed that the heat transfer rates are monotonic for the upper triangle whereas a few local maxima in heat transfer rates occur for smaller Pr within lower triangular domain. Overall, fluid with any Pr may be useful for enhanced heat transfer within the upper triangle but fluid with high Pr may be preferred for the lower triangle. � 2010 Elsevier Ltd. |
| Databáze: | OpenAIRE |
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