LOW REYNOLDS NUMBER PERFORMANCE OF A MODEL PERFORATED PLATE HEAT EXCHANGER MATRIX

1994 ◽  
Author(s):  
Sukhyun Kim ◽  
Anthony F. Mills
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Low Reynolds Number ◽  
Perforated Plate ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Low Reynolds

A Numerical Study of the Plate Heat Exchanger With Compound Corrugations in the Condition of Low Reynolds Number and High Prandtl Number

2010 ◽  
Author(s):  
Xing Cao ◽  
Wenjing Du ◽  
Guanmin Zhang ◽  
Lin Cheng
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Heat Exchanger ◽  
Flow Resistance ◽  
Heat Transfer Performance ◽  
Low Reynolds Number ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
High Prandtl Number ◽  
Low Reynolds

In general the conventional plate heat exchanger has good heat transfer performance on the one hand and high pressure drop on the other hand. In order to deal with this dilemma, a novel plate heat exchanger with compound corrugations is proposed in this paper. Comparisons with the traditional plate heat exchanger indicate that the new heat exchanger can reduce flow resistance and simultaneously improve its heat transfer performance. The heat-transfer oil with a relatively high dynamic viscosity is selected as the working fluid. The performance in the newly-proposed plate heat exchanger with compound corrugations in the condition of low Reynolds number and high Prandtl number is numerically investigated. In the process of numerical simulations, variations are made on one geometric parameter of the plates and keep invariant for the others. Through comparisons on the j-factor, the friction factor and their ratio j/f for various plate geometries, the influence of geometry parameters on heat transfer performance, flow resistance characteristics and comprehensive heat exchanger performance is thoroughly examined. Based on numerical results, the geometric parameters which have significant impact on heat transfer and flow resistance of the proposed plate heat exchanger are determined. And the Nusselt number and friction factor correlations of the plate heat exchanger with compound corrugations are obtained, which are applicable for the laminar flow mode when the working fluid is with low Reynolds number and high Prandtl number.

scholarly journals An Experimentally Validated Numerical Modeling Technique for Perforated Plate Heat Exchangers

2010 ◽  
Vol 132 (11) ◽  
Author(s):  
M. J. White ◽  
G. F. Nellis ◽  
S. A. Klein ◽  
W. Zhu ◽  
Y. Gianchandani
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Model ◽  
Heat Exchangers ◽  
Perforated Plate ◽  
Plate Heat Exchanger ◽  
Internal Temperature ◽  
Perforated Plates ◽  
Axial Conduction ◽  
Plate Heat

Cryogenic and high-temperature systems often require compact heat exchangers with a high resistance to axial conduction in order to control the heat transfer induced by axial temperature differences. One attractive design for such applications is a perforated plate heat exchanger that utilizes high conductivity perforated plates to provide the stream-to-stream heat transfer and low conductivity spacers to prevent axial conduction between the perforated plates. This paper presents a numerical model of a perforated plate heat exchanger that accounts for axial conduction, external parasitic heat loads, variable fluid and material properties, and conduction to and from the ends of the heat exchanger. The numerical model is validated by experimentally testing several perforated plate heat exchangers that are fabricated using microelectromechanical systems based manufacturing methods. This type of heat exchanger was investigated for potential use in a cryosurgical probe. One of these heat exchangers included perforated plates with integrated platinum resistance thermometers. These plates provided in situ measurements of the internal temperature distribution in addition to the temperature, pressure, and flow rate measured at the inlet and exit ports of the device. The platinum wires were deposited between the fluid passages on the perforated plate and are used to measure the temperature at the interface between the wall material and the flowing fluid. The experimental testing demonstrates the ability of the numerical model to accurately predict both the overall performance and the internal temperature distribution of perforated plate heat exchangers over a range of geometry and operating conditions. The parameters that were varied include the axial length, temperature range, mass flow rate, and working fluid.

Performance Study of a Dimpled-Protruded Air-to-Air Plate Heat Exchanger

2015 ◽  
Author(s):  
Amro M. Alqutub ◽  
Majid T. Linjawi ◽  
Ismail M. Alrawi
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Flow Direction ◽  
Plate Heat Exchanger ◽  
Performance Study ◽  
Maximum Heat ◽  
Plate Heat ◽  
Structural Support ◽  
Two Fluids ◽  
Aluminum Plates

In the present study, the overall heat transfer coefficient, friction factors, and effectiveness of a dimple-protrusion air-to-air counter-flow plate heat exchanger have been measured at low Reynolds number (500 < Re < 4,000). The heat exchanger consists of 4 channels per flow direction built using 1 mm aluminum plates. Dimples are specially arranged such that protrusions are opposed for applications that require structural support to withstand high pressure difference between the two fluids. A maximum heat enhancement level of 3.2 was obtained with a penalty of increased friction factor by 9 times which leads to a maximum performance factor of 1.5. The effectiveness obtained was found to be almost independent of Reynolds number on most tested Re. A detailed uncertainty analysis has been performed to determine the uncertainty in the results.

scholarly journals Modelling & Numerical Investigation of the Effectiveness of Plate Heat Exchanger for Cooling Engine Oil Using ANSYS CFX

2021 ◽  
Vol 39 (2) ◽  
pp. 653-658
Author(s):  
Abhishek Agarwal
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Plate Heat Exchanger ◽  
Engine Oil ◽  
Complex Flows ◽  
Process Industries ◽  
Plate Heat ◽  
Ansys Cfx ◽  
Design Software ◽  
High Reynolds

Heat exchangers are used for various industrial application for transfer of enthalpy from hot fluid to cold. One of them is Plate Heat Exchanger which finds its application in evaporating systems. The compactness, high effectiveness and easy maintenance of Plate Heat Exchanger makes it best choice for process industries. The current research investigates the application of Plate Heat Exchanger in cooling of engine oil using techniques of Computational Fluid Dynamics for low, medium and high Reynolds number using ANSYS CFX software. The CAD model is developed using Creo design software and turbulence model used for analysis is RNG k-epsilon which gives good predictions for complex flows involving swirls. The CFD analysis is conducted for different values of Reynolds number. The temperature distribution, effectiveness and overall heat transfer coefficient is determined for different values of Reynolds number.

Experiments and Modeling of a Mesoscale Laminar Plate Heat Exchanger

1999 ◽  
Author(s):  
Seung-Ho Hong ◽  
Vanessa Kenning ◽  
Charles Call ◽  
Reza Shekarriz
Keyword(s):  
Boundary Condition ◽  
Reynolds Number ◽  
Heat Exchanger ◽  
Periodic Boundary Condition ◽  
Periodic Boundary ◽  
Single Layer ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Layer Arrangement ◽  
Air Stream

Abstract In this paper, the results of an experimental and computational study on the development of a plate heat exchanger are presented and discussed. We have evaluated the characteristics of a miniature counterflow plate heat exchanger (PHE) using air as the working fluid. Because of the small characteristic channel dimension (Dh ≤ 1.9mm) and specific application of interest, the Reynolds number produced ranged between 20 &lt; ReD &lt; 1500, well within the laminar flow regime. The mass flow rates of the two hot and cold streams were maintained the same. Two different configurations were tested and modeled. The first configuration was the single-layer condition where one cold air stream was adjacent to another hot air stream in a counter-flow arrangement. The second configuration was the interleaved channel arrangement where the different layers alternate between cold and hot streams. Experiments were performed on a series of heat exchangers made of aluminum and stainless steel. The channel dimensions were 1mm × 20mm × 75mm. Because the flow region consists of hydrodynamically developing and fully developed flow for the range of Reynolds numbers tested, the experimental results show higher pressure drop compared with the results of fully developed parallel-plate channel flow and this difference increases with increasing Reynolds number. The dependency of Nusselt number on Reynolds number in the periodic boundary condition was larger than the single-layer arrangement. Further, the periodic boundary condition generates higher effectiveness than the single-layer arrangement. It was found that when using aluminum plates instead of stainless steel, axial conduction results in nearly 35% reduction in the overall heat transfer coefficient between hot- and cold-side channels. Computational results, corroborated with experimental data, suggested the use of an interleaved channel geometry for obtaining an effectiveness of 90% or higher when operating within the low mass flow rate regime.

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