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Erschienen in:
2015 | OriginalPaper | Buchkapitel
11. Internal Flows Models
verfasst von : George Sidebotham
Erschienen in: Heat Transfer Modeling
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Abstract
It is common for engineering devices to be designed with pipes or ducts in which fluids (gas or liquid) flow. The fluid enters at an inlet temperature and the walls of the duct are at a different temperature. This chapter addresses internal flows in which a single ducted stream is involved. The next chapter considers heat exchangers, where one stream transfers heat to another. When mass flows into a control volume, it carries the energy associated with it. This mechanism of energy transfer is termed advection and will be modeled as a fluid temperature-dependent current source. There are also momentum considerations, as the flows are driven by pressure (or gravity) and opposed by friction, so that pumps or compressors are generally needed to move the fluid. Several 1-node models are developed (thermally long, thermally short, average temperature, and well mixed) and contrasted. The choice of a model in practice depends on whether temperatures or flow rates are considered to be input parameters.