Heat exchange and hydraulic resistance in perforated-plate heat exchangers

1978 ◽  
Vol 14 (8) ◽  
pp. 701-704 ◽  
Author(s):  
V. K. Orlov ◽  
S. A. Shevyakova ◽  
G. N. Valeev
Keyword(s):  
Heat Exchange ◽  
Hydraulic Resistance ◽  
Heat Exchangers ◽  
Perforated Plate ◽  
Plate Heat

Investigation of heat transfer and hydraulic resistance in small-scale pillow-plate heat exchangers

Energy ◽  
2019 ◽  
Vol 181 ◽  
pp. 1213-1224 ◽  
Author(s):  
Olga Arsenyeva ◽  
Mark Piper ◽  
Alexander Zibart ◽  
Alexander Olenberg ◽  
Eugeny Y. Kenig
Keyword(s):  
Heat Transfer ◽  
Hydraulic Resistance ◽  
Heat Exchangers ◽  
Small Scale ◽  
Plate Heat

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.

Construction and preliminary testing of perforated-plate heat exchangers for use in helium IIrefrigerators

Cryogenics ◽  
1994 ◽  
Vol 34 ◽  
pp. 325-328 ◽  
Author(s):  
François Viargues ◽  
Gerard Claudet ◽  
Peter Seyfert
Keyword(s):  
Heat Exchangers ◽  
Perforated Plate ◽  
Preliminary Testing ◽  
Plate Heat

Compact high efficiency perforated-plate heat exchangers

Cryogenics ◽  
1976 ◽  
Vol 16 (7) ◽  
pp. 437-439 ◽  
Author(s):  
O.P. Anashkin ◽  
V.E. Keilin ◽  
V.M. Patrikeev
Keyword(s):  
Heat Exchangers ◽  
High Efficiency ◽  
Perforated Plate ◽  
Plate Heat

scholarly journals DEVELOPMENT OF HIGH EFFICIENT SHELL-AND-TUBE HEAT EXCHANGERS BASED ON PROFILED TUBES

2020 ◽  
Author(s):  
Djamalutdin Chalaev ◽  
◽  
Nina Silnyagina ◽  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Transfer Coefficient ◽  
Hydraulic Resistance ◽  
Heat Exchangers ◽  
Experimental Studies ◽  
Corrugated Tube ◽  
The Heat Transfer Coefficient

The use of advanced heat transfer surfaces (corrugated tubes of various modifications) is an effective way to intensify the heat transfer and improve the hydraulic characteristics of tubular heat exchangers. The methods for evaluating the use of such surfaces as working elements in tubular heat exchangers have not been developed so far. The thermal and hydrodynamic processes occurring in the tubes with the developed surfaces were studied to evaluate the efficiency of heat exchange therein. Thin-walled corrugated flexible stainless steel tubes of various modifications were used in experimental studies. The researches were carried out on a laboratory stand, which was designed as a heat exchanger type "tube in tube" with a corrugated inner tube. The stand was equipped with sensors to measure the thermal hydraulic flow conditions. The comparative analysis of operation modes of the heat exchanger with a corrugated inner tube of various modifications and the heat exchanger with a smooth inner tube was performed according to the obtained data. Materials and methods. A convective component of the heat transfer coefficient of corrugated tube increased significantly at identical flow conditions comparing with a smooth tube. Increasing the heat transfer coefficient was in the range of 2.0 to 2.6, and increased with increasing Reynolds number. The increase in heat transfer of specified range outstripped the gain of hydraulic resistance caused by increase of the flow. Results and discussion. CFD model in the software ANSYS CFX 14.5 was adapted to estimate the effect of the tube geometry on the intensity of the heat transfer process. A two-dimensional axially symmetric computer model was used for the calculation. The model is based on Reynolds equation (Navier-Stokes equations for turbulent flow), the continuity equation and the energy equation supplemented by the conditions of uniqueness. SST-turbulence model was used for the solution of the equations. The problem was solved in the conjugate formulation, which allowed assessing the efficiency of heat exchange, depending on various parameters (coolant temperature, coolant velocity, pressure). The criteria dependences were obtained Nu = f (Re, Pr). Conclusions. The use a corrugated tube as a working element in tubular heat exchangers can improve the heat transfer coefficient of 2.0 - 2.6 times, with an increase in hydraulic resistance in the heat exchanger of 2 times (compared with the use of smooth tubes). The criteria dependences obtained on the basis of experimental studies and mathematical modeling allow developing a methodology for engineering calculations for the design of new efficient heat exchangers with corrugated tubes.

scholarly journals RELEVANCE OF CONTAMINATION MODELS FOR DIAGNOSTICS OF PLATE HEAT EXCHANGERS

2020 ◽  
Vol 5 (10) ◽  
pp. 33-40
Author(s):  
Y. Elistratova ◽  
A. Seminenko ◽  
V. Minko
Keyword(s):  
Heat Exchange ◽  
Heat Exchangers ◽  
Heat Supply ◽  
Heating Surface ◽  
Actual Distribution ◽  
Plate Heat ◽  
Salt Deposition ◽  
Theoretical Approaches ◽  
Heat Supply Systems ◽  
Supply Systems

The article analyzes various theoretical approaches to describing the processes of formation of scale layers on the working surfaces of heat exchangers. The main tasks include analyzing existing models of contamination of heat exchange channels, determining the main mechanism of salt deposition on the heating surface of plate heat exchangers of heat supply systems, determining the main factors that determine the intensity of salt deposition on the working plate in accordance with the dynamics of heat and hydraulic processes in heat exchange channels formed by corrugated plates, as well as forming trends for further research. The article presents the main results of research devoted to the study of contamination processes on heating surfaces. Inaccuracies in the proposed approaches to describing the nature of the formation of salt deposition layers are identified. By generalizing existing approaches to the mathematical description of pollution processes, the main assumptions are revealed when describing the processes of salt deposition on working plates. A hypothesis is proposed about the influence of the location of channels relative to the inlet pipe on the uniformity of the flow distribution between parallel channels in the device. There is a fairly large gap between the existing computational methods for modeling pollution processes and the actual distribution of scale layers during the operation of heat exchange equipment of heat supply systems

scholarly journals Experimental and analytical research of the heat transfer process in the package of perforated plates

2016 ◽  
Vol 20 (suppl. 5) ◽  
pp. 1251-1257
Author(s):  
Predrag Zivkovic ◽  
Mladen Tomic ◽  
Jelena Janevski ◽  
Zana Stevanovic ◽  
Biljana Milutinovic ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Heat Exchangers ◽  
Perforated Plate ◽  
Heat Transfer Process ◽  
Experimental Chamber ◽  
Transfer Coefficients ◽  
Perforated Plates ◽  
Plate Heat ◽  
The Individual

The need for compact heat exchangers has led to the development of many types of surfaces that enhance the rate of heat transfer, among them the perforated plate heat exchangers, also known as matrix heat exchangers. The perforated plate heat exchangers consist of a series of perforated plates that are separated by a series of spacers. The present study investigates the heat transfer characteristics of the package of perforated plates. Perforated plates were 2 mm thick, with holes with 2 mm in diameter and porosity of 25.6%. The package of one, two, and three perforated plates was set in the channel of the experimental chamber at which entrance was a thrust fan with the ability to control the flow rate. The fluid flow rates, the temperatures of the fluids at the inlet and outlet of the chamber and the temperature of the air between the plates, were measured at the predefined locations in the package and the experimental chamber. Based on the measurements, heat transfer coefficients for the individual plates, as well as for the packages of perforated plates were determined. In further research, an iterative analytical procedure for investigation of the heat transfer process and the overall heat transfer coefficient for the package of perforated plates were developed. Based on these analytical and experimental results, conclusions were drawn about the heat transfer in a package of perforated plates.

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