On the computation of the thermoelastic characteristics of a perforated plate of a heat exchanger

2000 ◽  
Vol 182 (1-2) ◽  
pp. 39-53 ◽  
Author(s):  
B. Aoubiza ◽  
M.B. Taghite ◽  
H. Lanchon-Ducauquis
Keyword(s):  
Heat Exchanger ◽  
Perforated Plate ◽  
Thermoelastic Characteristics

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.

Stiffening Effects of Tubes in Heat Exchanger Tubesheet

1984 ◽  
Vol 106 (3) ◽  
pp. 237-246 ◽  
Author(s):  
T. Terakawa ◽  
A. Imai ◽  
K. Yagi ◽  
Y. Fukada ◽  
K. Okada
Keyword(s):  
Heat Exchanger ◽  
Young’S Modulus ◽  
Tube Wall ◽  
Young's Modulus ◽  
Perforated Plate ◽  
Load Condition ◽  
Experimental Tests ◽  
Uniaxial Tensile ◽  
Hydraulic Test ◽  
Tube Heat Exchanger

Strain-measuring tests were performed with strain gages on rectangular coupons taken from perforated plate with triangular pitch under both uniaxial tensile loads and pure bending loads. The effective Young’s modulus obtained from the tests have strong correlation with the values recommended by the ASME Code. Next, to evaluate the stiffening effects of tubes, similar strain-gage tests were performed for different types of perforated coupons. One type had the tubes strength welded into the penetration holes of the test coupons. Another type had the tubes both expanded and strength welded into the test coupons. Stiffening effects of tubes are clearly obtained from these tests. Judging from the effective Young’s modulus of triangular pitch obtained by the testing, the recommended minimum credit given to the tube wall is 50 percent under elastic load condition. In addition, for experimental tests on an actual large-sized shell-and-tube heat exchanger under hydraulic test condition, good correlation was obtained between calculated and measured stress when full credit was taken for the tube wall in the calculation.

CFD Simulation on Flow Distribution in Plate-Fin Heat Exchangers

2013 ◽  
Vol 655-657 ◽  
pp. 445-448
Author(s):  
Zhe Zhang ◽  
Jin Jin Tian ◽  
Yong Gang Guo
Keyword(s):  
Fluid Flow ◽  
Heat Exchanger ◽  
Cfd Simulation ◽  
Perforated Plate ◽  
Flow Distribution ◽  
Numerical Results ◽  
Flow Maldistribution ◽  
The Mathematical Model ◽  
First Time ◽  
Flow Nonuniformity

The influences of the conventional header configuration used in industry at present on the fluid flow distribution in plate-fin heat exchanger were numerically investigated. The numerical results showed that the fluid flow maldistribution is very serious in the heat exchanger. The header configuration with perforated plate was brought forward for the first time. The computational results indicated that the improved header configuration can effectively improve the performance of fluid flow distribution in the heat exchanger. The fluid flow distribution for the header configuration with curving perforated plate is more uniform than for the header configuration with plane perforated plate. The absolute degree of fluid flow nonuniformity in plate-fin heat exchanger has reduced from 3.47 to 0.32 by changing the header configuration. The numerical results are compared with the experimental results. They are basically consistent which indicates that the mathematical model and the calculating method are reliable.

Rational Analysis of Heat-Exchanger Tube-Sheet Stresses

1956 ◽  
Vol 23 (3) ◽  
pp. 468-473
Author(s):  
Yi-Yuan Yu
Keyword(s):  
Heat Exchanger ◽  
Present Method ◽  
Maximum Stress ◽  
Perforated Plate ◽  
Tube Sheet ◽  
Heat Exchanger Tube ◽  
Rational Analysis ◽  
Side Pressure ◽  
Limiting Values ◽  
Exchanger Tube

Abstract The paper presents a rational method of analysis of heat-exchanger tube-sheet stresses. While the tube sheet is taken to be a perforated plate on an elastic foundation in the manner of Gardner and Miller, it is also considered as part of an integrated indeterminate structure, and the interaction between the tube sheet and the connecting cylindrical shells and flange of the exchanger is determined so that a condition may be formulated which the edge rotation and edge moment of the tube sheet must satisfy. In general, neither the edge rotation nor the edge moment is zero; the edge of a tube sheet is therefore neither clamped nor simply supported. Application of the present method to four different types of heat exchangers is described in detail. To illustrate the method, Gardner’s example of a fixed-tube-sheet exchanger is recalculated. While Gardner’s method yields only the two limiting values of the maximum stress in the tube sheet, which differ by more than 100 per cent, the present method makes it possible to determine the exact value of this maximum stress. By means of the present method, the stresses in the other parts of the heat exchanger, namely, the tubes, shell, head, and flange, also can be calculated. As a consequence of the present analysis, it is found that, in the external-floating-head type of exchanger, the tube-sheet stress is not independent of the shell-side pressure, which is contrary to Gardner’s and Miller’s conclusions.

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