How flow dispersion affects exchanger performance
The Fluid Dynamics of the two streams in heat exchangers have not been analyzed sufficiently for studies of pressure drop. While the effect of axial dispersion of the process stream on the driving force is generally considered in the design of mass transfer operations, it is ignored for the design of the heat transmitting area. There may exist, however, large differences in heat exchanger efficiency as a result of different flow patterns, which may lie between perfect mixing and plug flow. In general, the heat transfer characteristics of different types of heat exchangers, e.g., single pass, cross flow, shell and tube, are represented by the correction factor F = Q/sub T//UA..delta..T/sub iotan/ or the heat exchanger effectiveness E = Q/sub T//((mc/sub p/)min (T/sub in/ - t/sub in/). Graphical representations are generally given for plug flow and perfect mixing and are used to obtain the heat transfer, transfer area and the fluid outlet temperatures. In reality, however, neither of the extremes, plug or perfect mixing, are to be expected. The flow patterns will be of an intermediate type. In this article, graphical representations are given for this situation in terms of the factor, E, whose application is recommended when outlet temperatures are to be calculated.
- Research Organization:
- Dept. of Chemical Engineering, Univ. of Pais Vasco, Bilbao
- OSTI ID:
- 6485719
- Journal Information:
- Hydrocarbon Process.; (United States), Vol. 66:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAT EXCHANGERS
FLOW MODELS
PERFORMANCE
TWO-PHASE FLOW
CALCULATION METHODS
EFFICIENCY
EQUATIONS
FLUID MECHANICS
GRAPHS
HEAT TRANSFER
MIXING
PRESSURE DROP
TEMPERATURE DEPENDENCE
ENERGY TRANSFER
FLUID FLOW
MATHEMATICAL MODELS
MECHANICS
421000* - Engineering- Combustion Systems
420400 - Engineering- Heat Transfer & Fluid Flow