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 < ReD < 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.

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.

Optimization of Plate Heat Exchanger by Using Response Surface Method

2016 ◽  
Vol 852 ◽  
pp. 681-687 ◽  
Author(s):  
R. Pachaiyappan ◽  
S. Gopalakannan
Keyword(s):  
Reynolds Number ◽  
Nusselt Number ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Plate Heat Exchanger ◽  
Reference Surface ◽  
Design Constraints ◽  
Plate Heat ◽  
Surface Method ◽  
Optimal Values

This study deals the purpose of optimal values of the design constraints in a Plate Heat Exchanger by using Response Surface Method (RSM). The special effects of design constraints such as Reynolds number, flow velocity and pressure drop are examined. In the Reference Surface Method experimental design method, Nusselt number and friction factor are considered as performance parameters. The analysis of Reference Surface Method conducted with an optimization process to reach minimum pressure drop (friction factor) and maximum heat transfer (Nusselt number) for the designed Plate heat exchanger. Experimental results authorized the correctness of the planned method. Design expert 7.0 has been used for optimization process. Optimal values are selected from highest desirability value which is 0.80161 and design constrains has been optimized as 1600(Reynolds number), 0.04 m2 (Core area), 1.24 m (Core length).

Experimental Investigation of Single Phase Pressure Drop in a Plate Heat Exchanger

2015 ◽  
Author(s):  
Tariq S. Khan ◽  
Mohammad S. Khan ◽  
Zahid H. Ayub
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Single Phase ◽  
Plate Heat Exchanger ◽  
Strong Function ◽  
Plate Heat ◽  
Improved Performance ◽  
Phase Water ◽  
Phase Pressure

Pressure drop characteristics of a gasketed commercial plate heat exchanger (PHE) configured for single phase water to water flow application are presented. Isothermal pressure drop data are provided for two symmetric 30°/30°, 60°/60° and a non-symmetric 30°/60° (mixed) chevron plate configuration in the plate heat exchanger. Reynolds number was varied from 500 to 2,500. The experimental data are found to be a strong function of chevron angle and Reynolds number. Performance evaluation results show that mixed plate configuration can be a choice in optimizing the PHE design for improved performance.

scholarly journals Characteristics of heat transfer and pressure drop in a chevron-type plate heat exchanger with Al2O3/water nanofluids

2017 ◽  
Vol 21 (6 Part A) ◽  
pp. 2379-2391 ◽  
Author(s):  
Murat Unverdi ◽  
Yasar Islamoglu
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Nusselt Number ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Volume Concentration ◽  
Plate Heat Exchanger ◽  
Distilled Water ◽  
Maximum Volume ◽  
Plate Heat

In this study, heat transfer and pressure drop characteristics have been experimentally investigated by using Al2O3-water nanofluids in the chevron-type plate heat exchanger. The purpose of the experiments was to determine the heat transfer coefficient and pressure drop for different flow rates of 90, 120, 150, 180, 240, and 300 kg/h and different volume concentrations of 0.25%, 0.5%, 0.75%, and 1% of the nanofluids. The Nusselt number of the nanofluids increased with the increasing volume concentration and flow rate at constant hot water flow rate and constant inlet temperatures. The increase in the Nusselt number is 42.4% when compared to distilled water at the maximum volume concentration and Reynolds number (600 ? Re ? 1900) in the nanofluids-plate heat exchanger. It has been concluded that nanofluids enhanced the heat transfer significantly and pressure drops at the maximum volume concentration and the Reynolds number increased by between 6.4% and 8.4% compared to distilled water.

scholarly journals Experimental and Numerical Study on Hydraulic Performance of Chevron Brazed Plate Heat Exchanger at Low Reynolds Number

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1076
Author(s):  
Yi Zhong ◽  
Kai Deng ◽  
Shenglang Zhao ◽  
Jinlin Hu ◽  
Yingjie Zhong ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Power Law ◽  
Numerical Study ◽  
Structural Parameters ◽  
Hydraulic Performance ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Brazed Plate Heat Exchanger

Few experiments have been performed to investigate the hydraulic performance in a chevron brazed plate heat exchanger (BPHE) with the narrow channel at lower Reynolds number. The hydraulic characteristics of seven types of chevron BPHEs were investigated experimentally and numerical simulation revealed the effects of structural parameters on hydraulic performances. The correlations between friction factor f and Re were fitted out based on more than 500 sets of pressure drop data. The research results show that there is a power-law between f and Re; which has a similar trend but a different amplitude for different plates, and the exponent of the power-law could be approximate to a constant. Numerical results show that the pressure drop Δp is positively correlated with the corrugated angle and spacing, however, negatively correlated with the corrugated height. Research on the hydraulic performance is significant for the optimal design of BPHE.

EXPERIMENTAL STUDY ON HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS FOR WELDED EMBOSSING TYPE PLATE HEAT EXCHANGERS

2011 ◽  
Vol 19 (02) ◽  
pp. 113-120 ◽  
Author(s):  
JONG YUN JEONG ◽  
CHUNG WOO JUNG ◽  
SANG-CHUL NAM ◽  
YONG TAE KANG
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Reynolds Number ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Heat Exchangers ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Temperature Solution ◽  
Fanning Friction Factor

Heat transfer and pressure drop characteristics of the welded plate heat exchangers are experimented to apply the high- and low-temperature solution heat exchanger (SHX) of absorption systems. Two different SHXs were made using the seam and tig welding method. In this paper, the welded embossing type plate heat exchangers were tested by controlling mass flow rate and inlet/outlet temperatures. It was found that heat transfer and pressure drop performance increased with increasing Reynolds number. It was also found that the pressure drop from the present W-embossing type plate heat exchanger was much lower than that from the brazed type, as low as 1/7 times. The experimental correlations for Nusselt number and Fanning friction factor were developed with the error bands of ± 20% and ± 25%, respectively. These results provide a guideline to apply the welded plate heat exchanger for the solution heat exchanger of absorption systems.

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.

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