Analysis of Composite Fouling in Corrugated Plate Heat Exchangers

2013 ◽  
Author(s):  
Guanmin Zhang ◽  
Guanqiu Li ◽  
Wei Li
Keyword(s):  
Heat Exchangers ◽  
Transfer Coefficients ◽  
Plate Height ◽  
Plate Heat ◽  
Heat Transfer Coefficients ◽  
Plate Spacing ◽  
Friction Factors ◽  
Water Side ◽  
Theoretical Investigations ◽  
Pitch Ratio

Experimental and theoretical investigations of water-side fouling have been performed inside four corrugated plate heat exchangers. They have different geometric parameters, such as plate height, plate spacing, and plate angle. Heat transfer coefficients and friction factors have been obtained in clean tests. Composite fouling experiments have also been performed. The tests are primarily focused on the effects of average velocity. Scanning electron microscope (SEM) was used to investigate the microscopic structures of composite fouling and analyze the fouling characteristics in composite fouling tests. The plate heat exchanger with the largest de and height to pitch ratio shows the best anti-fouling performance.

Investigation of Precipitation Fouling in Corrugated Plate Heat Exchangers

2013 ◽  
Author(s):  
Guanmin Zhang ◽  
Guanqiu Li ◽  
Wei Li ◽  
David Kukulka
Keyword(s):  
Heat Exchangers ◽  
Plate Height ◽  
Plate Heat ◽  
Plate Spacing ◽  
Theoretical Investigations ◽  
Coated Plate ◽  
Pitch Ratio ◽  
Precipitation Fouling ◽  
Semi Empirical ◽  
Ss 304

Experimental and theoretical investigations of precipitation fouling performance have been performed inside four corrugated plate heat exchangers (PHE). They have different geometry parameters, such as plate height, plate spacing, and plate angle. Heat transfer coefficient and friction factor have been obtained in the clean tests with the range of Reynolds number of 600–6000. Three precipitation fouling experiments focused on temperature influences and geometric designs have been performed. PHE with the largest hydraulic diameter and height to pitch ratio shows the best anti-fouling performance. Scanning electron microscope is used to investigate the microscopic structures of precipitation fouling. A type of Teflon coated plate has been used for testing the anti-fouling characteristic of PHEs. The coated plates show well anti-fouling performance comparing with the common SS-304 plates. A semi-empirical fouling model using Prandtl analogy has been established. The model predictions agree well with experimental data.

scholarly journals Heat transfer coefficients and pressure drops of highly viscous fluids in plate heat exchangers.

1989 ◽  
Vol 15 (5) ◽  
pp. 924-930 ◽  
Author(s):  
Hideo Shidara ◽  
Motokazu Kikuchi ◽  
Mikio Kanzaki ◽  
Masafumi Kuriyama ◽  
Hirotaka Konno
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Viscous Fluids ◽  
Transfer Coefficients ◽  
Pressure Drops ◽  
Plate Heat ◽  
Heat Transfer Coefficients

Experimental Study and Genetic-Algorithm-Based Correlation on Shell-Side Heat Transfer and Flow Performance of Three Different Types of Shell-and-Tube Heat Exchangers

2006 ◽  
Vol 129 (9) ◽  
pp. 1277-1285 ◽  
Author(s):  
Qiu-wang Wang ◽  
Gong-nan Xie ◽  
Bo-tao Peng ◽  
Min Zeng
Keyword(s):  
Heat Transfer ◽  
Genetic Algorithm ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Heat Exchangers ◽  
Transfer Coefficients ◽  
Shell Side ◽  
Heat Transfer Coefficients ◽  
Friction Factors ◽  
Shell And Tube

The heat transfer and pressure drop of three types of shell-and-tube heat exchangers, one with conventional segmental baffles and the other two with continuous helical baffles, were experimentally measured with water flowing in the tube side and oil flowing in the shell side. The genetic algorithm has been used to determine the coefficients of correlations. It is shown that under the identical mass flow, a heat exchanger with continuous helical baffles offers higher heat transfer coefficients and pressure drop than that of a heat exchanger with segmental baffles, while the shell structure of the side-in-side-out model offers better performance than that of the middle-in-middle-out model. The predicted heat transfer rates and friction factors by means of the genetic algorithm provide a closer fit to experimental data than those determined by regression analysis. The predicted corrections of heat transfer and flow performance in the shell sides may be used in engineering applications and comprehensive study. It is recommended that the genetic algorithm can be used to handle more complicated problems and to obtain the optimal correlations.

Surface Microfouling During the Induction Period

1983 ◽  
Vol 105 (3) ◽  
pp. 618-624 ◽  
Author(s):  
R. E. Baier ◽  
A. E. Meyer ◽  
V. A. DePalma ◽  
R. W. King ◽  
M. S. Fornalik
Keyword(s):  
Heat Transfer ◽  
Induction Period ◽  
Heat Exchangers ◽  
Transfer Coefficients ◽  
Flow Cells ◽  
Heat Transfer Coefficients ◽  
Water Side ◽  
Second Wave ◽  
Initial Pattern ◽  
Rapid Adsorption

The time during which newly installed or cleaned heat transfer surfaces remain free of fouling deposits thick enough to diminish heat transfer coefficients or energy efficiency is often called the “induction period,” a term disguising lack of knowledge of the microfouling events actually occurring. Using novel flow cells to conduct water of fresh, brackish, and oceanic quality, natural and treated with antifouling chemicals, over test surfaces of different clean and coated metals, it has been observed that the initial pattern of fouling deposits is remarkably similar in all circumstances. Rapid adsorption of protein-dominated films is followed by attachment of rodlike bacteria, bacterial exudation, colonization by a second wave of prosthecate microorganisms, additional secretion, and growth of debris-trapping filamentous appendages. Although inappropriate to extrapolate the noted rates of these processes to in-plant heat exchangers at present, this sequence of microfouling events seems universal enough to characterize the induction period of all water-side biofouling phenomena.

scholarly journals Numerical and experimental investigation of heat transfer of ZnO/Water nanofluid in the concentric tube and plate heat exchangers

2011 ◽  
Vol 15 (1) ◽  
pp. 183-194 ◽  
Author(s):  
Fard Haghshenas ◽  
Mohammad Talaie ◽  
Somaye Nasr
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Rate ◽  
Heat Exchangers ◽  
Transfer Rate ◽  
Transfer Coefficients ◽  
Flow Rates ◽  
Plate Heat ◽  
Heat Transfer Coefficients ◽  
Mass Flow Rates

The plate and concentric tube heat exchangers are tested by using the water-water and nanofluid-water streams. The ZnO/Water (0.5%v/v) nanofluid has been used as the hot stream. The heat transfer rate omitted of hot stream and overall heat transfer coefficients in both heat exchangers are measured as a function of hot and cold streams mass flow rates. The experimental results show that the heat transfer rate and heat transfer coefficients of the nanofluid in both of the heat exchangers is higher than that of the base liquid (i.e., water) and the efficiency of plate heat exchange is higher than concentric tube heat exchanger. In the plate heat exchanger the heat transfer coefficient of nanofluid at mcold = mhot = 10 gr/sec is about 20% higher than base fluid and under the same conditions in the concentric heat exchanger is 14% higher than base fluid. The heat transfer rate and heat transfer coefficients increases with increase in mass flow rates of hot and cold streams. Also the CFD1 code is used to simulate the performance of the mentioned heat exchangers. The CFD results are compared to the experimental data and showed good agreement. It is shown that the CFD is a reliable tool for investigation of heat transfer of nanofluids in the various heat exchangers.

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