Plate heat exchangers: calculation of pressure drop for single phase convection in turbulent flow regime

2021 ◽  
Author(s):  
Sergej Gusew ◽  
René Stuke
Keyword(s):  
Pressure Drop ◽  
Turbulent Flow ◽  
Flow Regime ◽  
Heat Exchangers ◽  
Single Phase ◽  
Plate Heat ◽  
Turbulent Flow Regime

scholarly journals Pressure Drop in Plate Heat Exchangers for Single-Phase Convection in Turbulent Flow Regime: Experiment and Theory

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Sergej Gusew ◽  
René Stuke
Keyword(s):  
Pressure Drop ◽  
Turbulent Flow ◽  
Flow Regime ◽  
Heat Exchangers ◽  
Plate Heat ◽  
Turbulent Flow Regime ◽  
Proposed Model ◽  
Correct Data ◽  
Typical Length ◽  
Good Agreement

Plate heat exchangers (PHEs) play an important role in different technical fields, namely, in energetics, chemical industry, food industry, and others. To use PHE effectively, it is necessary to have correct data for pressure drop. Unfortunately, in open literature, a large difference among different authors occurs. In this work is shown that an essential portion of this difference lies in the choice of the typical length for the calculation of the friction coefficient. Care must be taken to consider the pressure drop of the distribution zone. A three-component model for hydraulic resistance of PHE in turbulent flow regime is proposed in this work. The proposed model shows good agreement with experimental data.

Pressure Drop Through Anisotropic Porous Mediumlike Cylinder Bundles in Turbulent Flow Regime

2008 ◽  
Vol 130 (10) ◽  
Author(s):  
Tongbeum Kim ◽  
Tian Jian Lu
Keyword(s):  
Pressure Drop ◽  
Turbulent Flow ◽  
Flow Regime ◽  
Force Balance ◽  
Balance Model ◽  
Hydraulic Radius ◽  
Turbulent Flow Regime ◽  
Yaw Angle ◽  
Flow Blockage ◽  
Open Configuration

Pressure drop through anisotropic porous mediumlike cylinder bundles is experimentally examined in turbulent flow regime. Three porosities, ε=0.66, 0.82, and 0.90, are considered. The flow blockage by the cylinder bundles is varied, with the yaw angle (α) used as an anisotropic measure. When the yaw angle is fixed while the porosity is varied, the pressure drop behaves as predicted by the force balance model, consistent with the classic observation: The pressure drop is proportional to the square of the flow velocity with the empirical proportionality as a function of (1−ε1∕2)∕ε2 obtained from the force balance model compared to that of (1−ε)∕ε3 from the hydraulic radius theory. On the other hand, for a given porosity, topological anisotropy of the cylinder bundles causes the sinusoidal response of the pressure drop to the variation of yaw angle. At α=0deg with a 60deg period, the lowest pressure drop occurs from the most open configuration of the cylinder bundle whereas the largest flow blockage at α=30deg causes the highest pressure drop. This variation appears to result from an increase in the drag coefficient of each cylinder element in a harmonic manner.

Flow Through a Finite Packed Bed of Spheres: A Note on the Limit of Applicability of the Forchheimer-Type Equation

2004 ◽  
Vol 126 (1) ◽  
pp. 139-143 ◽  
Author(s):  
Agne`s Montillet
Keyword(s):  
Reynolds Number ◽  
Pressure Drop ◽  
Turbulent Flow ◽  
Flow Regime ◽  
Fluid Velocity ◽  
Type Equation ◽  
Packed Bed ◽  
Turbulent Flow Regime ◽  
Fully Developed Turbulent Flow ◽  
Flow Through

The variation of the pressure drop measured as a function of the fluid velocity through a packed bed of spheres is presented and discussed in the range of particle Reynolds number 30–1500. Based on previous studies, the observed limit of validity of the so-called Forchheimer law may be attributed to the concomitant effects of the finite character of the tested bed and of the transition of flow regime which is marking the beginning of the fully developed turbulent flow regime. The limit of validity of the Forchheimer-type law was formerly noticed by several authors.

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