Strategy for selection of elements for heat transfer enhancement

Sahiti, Naser; Durst, F.; Dewan, Anupam

doi:10.1016/j.ijheatmasstransfer.2006.03.011

Cited by 43 publications

(19 citation statements)

References 6 publications

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“…The optimal designs are selected based on the maximization of heat transfer per unit volume with a minimization of the power input. More details on this assessment method are given in [20,21].…”

Section: Performance Assessment Methodsmentioning

confidence: 99%

Numerical investigations for the optimization of serrated finned-tube heat exchangers

Lemouedda

Schmid

Franz

et al. 2011

Applied Thermal Engineering

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Helical serrated finned-tubes are well established in many thermal systems. This paper presents the results of numerical calculations carried out for the performance improvement of these devices. The work is divided into three main investigations conducted for Reynolds numbers between Re = 600 and 2600. The first investigation shows the effect of the fin serration, where a comparison between performances of finned tubes with and without fin serration is presented. Another main investigation is conducted on the effect of fin twisting of the outermost part of the fin on the performance of the serrated finned-tubes. Here, twisting angles considered are between β = 0• and 25• .The third investigation deals with the effect of the number of fin segments per period.

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Section: Performance Assessment Methodsmentioning

confidence: 99%

Numerical investigations for the optimization of serrated finned-tube heat exchangers

Lemouedda

Schmid

Franz

et al. 2011

Applied Thermal Engineering

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“…Five consecutive measurements were obtained for Reynolds numbers in the range of 400 to 2800 using two pressure taps as shown in Figure 4.13. The pumping power per unit volume from Sahiti's work [66] can be written as shown in Eq 15.…”

Section: Pressure Loss Testsmentioning

confidence: 99%

“…In this study was assumed to be 0.8 which is taken from Sahiti's [66] work as standard value for this category of fans in industry. The mass, momentum and energy equations were solved using a coupled implicit scheme.…”

Section: Pressure Loss Testsmentioning

confidence: 99%

Influence of Alumina Addition to Aluminum Fins for Compact Heat Exchangers Produced by Cold Spray Additive Manufacturing

et al. 2015

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Aluminum and aluminum-alumina powder mixtures were used to produce pyramidal fin arrays on aluminum substrates using cold spray as an additive manufacturing process. Using aluminum-alumina mixtures instead of pure aluminum powder could be seen as a costeffective measure, preventing nozzle clogging. The fin geometries that were produced were observed using a 3D digital microscope to determine the flow passages width and fins geometric details. Heat transfer and pressure tests were carried out using different ranges of appropriate Reynolds numbers for the sought commercial application to compare each fin array and determine the effect of alumina content. It was found that the presence of alumina reduces the fins' performance when compared to pure aluminum but that they still outperform traditional fins. Numerical simulations were performed and were used to explain

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“…Additionally buffer regions were placed after the outlets of the heat exchanger to ensure numerical stability inside the flow domain of interest. For the reference case a total number of grid points of about 810 6 and for all other cases of about 12-1410 6 was implemented. Due to the simpler geometry, the reference case (smooth walls) could be constituted only from hexahedrons.…”

Section: Numerical Investigationmentioning

confidence: 99%

“…There are several approaches and parameters exist which evaluate and compare heat exchangers with varying designs (see e.g. Sahiti et al [6]). Here, we follow the notion of the so-called thermal performance parameters proposed by for example Hwang et al [4] and Burgess and Ligrani [7].…”

Section: Data Processingmentioning

confidence: 99%

Experimental and numerical investigation of real world dimpled heat exchanger

Preibisch¹,

Buschmann²

2010

Advanced Computational Methods and Experiments in Heat Transfer XI

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This study is motivated by the observation that recent investigations of dimpled surfaces rarely go beyond single plates or channels. Here, we explore a real world cross flow heat exchanger (400400100 mm³). It is found that in any dimpled configuration the exchanged heat is larger than in the reference case (smooth walls). The enhancement of the specific heat transfer per unit area can exceed 40%. Reasonable agreement of global parameters with numerical simulations (FLUENT) is obtained when the whole heat exchanger considering each individual structure is modelled. Based on that finding we analyse the numerical results in order to obtain information on local flow situation and in order to find physical explanations for the different enhancement found in different geometrical configurations.

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Strategy for selection of elements for heat transfer enhancement

Cited by 43 publications

References 6 publications

Numerical investigations for the optimization of serrated finned-tube heat exchangers

Numerical investigations for the optimization of serrated finned-tube heat exchangers

Influence of Alumina Addition to Aluminum Fins for Compact Heat Exchangers Produced by Cold Spray Additive Manufacturing

Experimental and numerical investigation of real world dimpled heat exchanger

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