Sensible heat and friction characteristics of plate fin-and-tube heat exchangers having plane fins

Wang, Chi-Chuan; Chang, Yu; Hsieh, Yi Chung; Lin, Yur Tsai

doi:10.1016/0140-7007(96)00021-7

Cited by 189 publications

(93 citation statements)

References 8 publications

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“…It can be seen from Figure 10 (b) that the variation of friction factor with is quite small, and when the row number is larger than 3, could be considered independent of . This result agrees well with that of the experiments by Wang (1996) and Wang (2000). Figure 10 (a) shows that Nusselt number decreases with the increasing of tube row number , and when >4, the decreasing trend slows down.…”

Section: Figure 21: Comparison Between Cfd Results Correlations and supporting

confidence: 82%

Optimization of Heat Exchangers

Catton¹

2010

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Executive SummaryThe objective of this research is to develop tools to design and optimize heat exchangers (HE) and compact heat exchangers (CHE) for intermediate loop heat transport systems found in the very high temperature reactor (VHTR) and other Generation IV designs by addressing heat transfer surface augmentation and conjugate modeling. To optimize heat exchanger, a fast running model must be created that will allow for multiple designs to be compared quickly. To model a heat exchanger, volume averaging theory, VAT, is used. VAT allows for the conservation of mass, momentum and energy to be solved for point by point in a 3 dimensional computer model of a heat exchanger. The end product of this project is a computer code that can predict an optimal configuration for a heat exchanger given only a few constraints (input fluids, size, cost, etc.). As VAT computer code can be used to model characteristics (pumping power, temperatures, and cost) of heat exchangers more quickly than traditional CFD or experiment, optimization of every geometric parameter simultaneously can be made. Using design of experiment, DOE and genetic algorithms, GE, to optimize the results of the computer code will improve heat exchanger design.For optimization to be accomplished, one needs to separate conduction and convection at its natural interface. This means friction and heat transfer at the interface needs to be treated in a way that allows each side to be independently varied. If you increase the flow rate, the heat transfer coefficient will increase and you need to take advantage of this by changing the geometry to modify the conduction side of the problem. Of course you try to do this while keeping the friction factor as small as possible. All of this is done within a complex heterogeneous hierarchical structure.iii Several issues arise when we set out to solve such a problem. One of the more interesting is how you compare CFD calculations to measured values of the two parameters that are needed.Another is how to directly use experimental data. The simple equations contain coefficients that are essentially averages of some kind and we are usually unsure of what they are. Measured friction factors are fairly straightforward to interpret although calculated values are not.Measured heat transfer coefficients are usually based on some kind of upper level assumptionsand often not what we need and calculated values can be difficult to interpret correctly. Using VAT to derive the simple equations leads us to a rigorous definition of the needed coefficients whether obtained from experiment or through the use of CFD.Determination of flow-variables and scalar transport in a heterogeneous (or porous) media is difficult even when subject to simplifications allowing the specification of medium periodicity or regularity. Linear or linearized models fail to intrinsically account for transport phenomena, requiring dynamic coefficient models to correct for short-comings in the governing models. Allowing inhomogeneities to adopt random or stocha...

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Section: Figure 21: Comparison Between Cfd Results Correlations and supporting

confidence: 82%

Optimization of Heat Exchangers

Catton¹

2010

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“…A detailed review of plate fin-and-tube refrigeration heat exchangers is beyond the scope of this paper, because some new material on circuit and frost modeling, as well as analysis results will be introduced. For a detailed review of operational details and data under different conditions, the reader is referred to (Seker et al, 2004a(Seker et al, , 2004b, (Wang et al, 1996) and (Wang et al, 1997).…”

Section: Methodsmentioning

confidence: 99%

“…(Rich, 1973) and (Rich, 1975) conducted a systematic study on air side heat transfer and pressure drop on several coils with variable fin spacing and tube rows. (Wang et al, 1996) and (Wang et al, 1997) investigated the effect of fin spacing, fin thickness, number of tube rows on heat transfer and pressure drop with commonly used tube diameters in HVAC coils, under dry and humid conditions respectively. (Chuah et al, 1998) investigated dehumidifying performance of plain fin-and-tube coils.…”

Section: Methodsmentioning

confidence: 99%

Numerical Modeling and Experimentation on Evaporator Coils for Refrigeration in Dry and Frosting Operational Conditions

Aidoun¹,

Ouzzane²,

Bendaoud³

2011

Two Phase Flow, Phase Change and Numerical Modeling

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“…The flow blockages, or obstacles, left in the fluid flow cause more complex flow formations, regular or irregular vortex sheddings, the flow blockages. The aerodynamic forces and the changes of the Strouhal number with the Reynolds number and gap ratio were studied by Wang (1996). It was observed that the increase of the Reynolds number value up to 500 increased the Strouhal number, after this value the Strouhal number did not change.…”

Section: Introductionmentioning

confidence: 99%

Edge Length Effect of Bluff Bodies on Flow Structure

Manay¹,

Özceyhan²,

Şahi̇n³

et al. 2014

Int J Automot Mech Eng

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This study investigates the flow structure around two identical triangles placed side by side, through experiment. Its goal is to investigate the effects of the edge length of the bluff bodies on flow structure. The flow characteristics are performed for a Reynolds number range varying from 5.000 to 10.000 under steady state conditions, and the flow was assumed to be two-dimensional. The flow characteristics around the bluff bodies were analyzed using particle image velocimetry (PIV) velocity measurement techniques, with 200 images. Water was used as the working fluid. For each case, velocity distributions along the channel height, velocity vectors and stream lines were presented to get better idea of the change of flow field. The variation in Strouhal number versus Reynolds number is presented. It was concluded for all the gap ratios that the primary recirculation zone and the secondary recirculation zone both occurred because the interaction was not strong. Asymmetrical and unstable flow structure behind the triangles was observed during the experiments. At the point at which the fluid made the first contact with the tips of the bodies, velocity became zero. The most effective parameters were found to be the flow velocity and the back track region. It was concluded that the points on which flow separations occurred moved away by an increasing Reynolds number. Because the vortex fields were symmetrical behind the smooth and the symmetrical elements, the Strouhal number was constant with the changing Reynolds number.

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Sensible heat and friction characteristics of plate fin-and-tube heat exchangers having plane fins

Cited by 189 publications

References 8 publications

Optimization of Heat Exchangers

Optimization of Heat Exchangers

Numerical Modeling and Experimentation on Evaporator Coils for Refrigeration in Dry and Frosting Operational Conditions

Edge Length Effect of Bluff Bodies on Flow Structure

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