Characteristics of flow distribution in compact parallel flow heat exchangers, part II: Modified inlet header
| Autor: | Ing Youn Chen, Jhong Syuan Tsai, Chi-Chuan Wang, Kai-Shing Yang |
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| Rok vydání: | 2011 |
| Předmět: |
Engineering drawing
Materials science Mass flow meter Isothermal flow Energy Engineering and Power Technology Laminar flow Mechanics Industrial and Manufacturing Engineering Flow measurement Open-channel flow Pipe flow Physics::Fluid Dynamics Primary flow element cardiovascular system Flow coefficient |
| Zdroj: | Applied Thermal Engineering. 31:3235-3242 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2011.06.003 |
| Popis: | This study experimentally and numerically investigates the single-phase flow into parallel flow heat exchangers with inlet and outlet rectangular headers having square cross section and 9 circular tubes. The effects of inlet flow condition, tube diameter, header size, area ratio, flow directions (Z and U-type), as well as the gravity are investigated. The experimental results indicate that flow distribution for U-type flow is more uniform than Z-type flow. Depending on the inlet volumetric flow rate, the flow ratio at the first several tubes can be lower than 50% of the last tube for Z-type arrangement, and this phenomenon becomes more and more pronounced with the rising velocity at the intake conduit. The mal-distribution can be eased via reducing the branching tube size or increasing the entrance settling distance at the intake conduit. It is found that the influence of gravity on mal-distribution is negligible and the mal-distribution is associated with the jet flow pattern. |
| Databáze: | OpenAIRE |
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