Laminar Forced Convection Heat Transfer over Staggered Circular Tube Banks: A CFD Approach

Ishak, M.; Tahseen, Tahseen Ahmad; Rahman, Md. Mustafizur

doi:10.15282/jmes.4.2013.6.0039

Cited by 25 publications

(15 citation statements)

References 28 publications

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“…The flow dynamics, heat dissipation and pollutant dispersion in urban areas can be obtained experimentally by on-site/wind-tunnel measurements or numerically by employing computational fluid dynamics (CFD) methods. As computer capabilities improve, CFD becomes more popular with its cost effectiveness and ability to test a wide variety of conditions [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

Reda

Zulkifli²,

Harun³

2017

J. MECH. ENG. SCI.

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Wind flow through urban areas is studied either by wind tunnel scale experiments or via computational fluid dynamics simulations through full-scale actual models. The large difference between the Reynolds numbers based on the geometries of actual cities and wind tunnel scale cities makes the dynamic similarity between the two models uncertain. In this study, the mean and turbulent flow parameters were investigated using a large eddy simulation for two models i.e. the actual urban area model and the wind tunnel scale (1:1000) model. Kuala Lumpur City Centre, Malaysia, was considered as the case study of an urban area. Vertical velocity profiles were plotted at five locations representing different building packing densities. The results of wind tunnel scale model largely agreed with the actual model with some discrepancies in the building vicinity and wakes. The dissimilarity of the wake patterns due to the large difference in Re was responsible for the deviations. Largest discrepancies were found in the lateral and wall-normal velocity components and turbulence stresses. The results casted a shadow on the applicability of the conclusions derived from the simulations on wind tunnel scale models to the actual urban environments they represented. The deviation between the two models should be assessed before proceeding with experimental or numerical simulations on small-sized models.

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Section: Introductionmentioning

confidence: 99%

Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

Reda

Zulkifli²,

Harun³

2017

J. MECH. ENG. SCI.

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“…Only one percent of drinking water sources is available and the rest of them are frozen in polar glaciers (2%) [1]. Some industrial processes such as the ozonation of wastewater [2] , wastewater purification by graphene oxide [3], wastewater purification by biological oscillatory flow reactor [4], wastewater filtration by nano tube bundles filters [5,6], etc. are the main candidates for freshwater production from wastewater sources.…”

Section: Introductionmentioning

confidence: 99%

“…The abovementioned literature review showed that the effects of various design and operating parameters (i.e. air gap [13], mass flow rate [7,17], wick material [15], internal reflector [19], baffle [17,20], inclined tray [21], steps geometry optimisation [22] and nanofluid [5,6]) on the freshwater productivity of stepped cascade solar still have been investigated. However, the effect of PV/T collector connection to stepped cascade solar still to enhance freshwater productivity is not investigated.…”

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confidence: 99%

Energy analysis of a stepped cascade solar still connected to photovoltaic thermal collector

Hedayati-Mehdiabadi¹,

Baluchestan²,

Sarhaddi³

et al. 2017

Int. J. Automot. Mech. Eng.

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In this paper, the performance evaluation of a stepped cascade solar still connected to photovoltaic thermal (PV/T) collector was carried out. The governing equations of problem was a set of initial value ordinary differential equations which were obtained by writing energy balance for the various components of solar still system (i.e. glass cover, brackish water, absorber plate, and PV/T collector). The numerical model of problem was solved by the 4th-order Runge-Kutta method under real climatic conditions sample. The validation of numerical model was carried out by the experimental data of previous literature. Parametric studies showed that the energy efficiency of stepped cascade solar still maximised in the desired brackish water flow of 0.03 kg/min and the PV/T collector area of 1.3 m 2 . The daily energy efficiency and accumulated freshwater were about 26% and 5.71 kg/(m 2 .day), respectively. An increase of about 20% was obtained in freshwater productivity by the connection of PV/T collector to the stepped cascade solar still. Also, PV/T collector, in addition to providing pumping power, can supply electrical power of about 0.918 kW/day for other uses. In order to produce freshwater during the night time, the usage of the phase change materials below the absorber plate was suggested.

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“…Flat tubes seem to have more appropriate pressure drop characteristics than circular tubes [7]. The forced convection heat transfer over a bundle of circular cylinders was investigated numerically [8][9][10][11] and non-square tubes in both in-line and staggered tube arrangements [12][13][14][15][16]. The flow over a bank of elliptical cylinder tubes was presented by Yianneskis et al [17], both numerically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Pressure Drop Prediction in an in-Line Flat Tube Bundle by Radial Basis Function Network

Tahseen

Rahman²

2014

Int. J. Automot. Mech. Eng.

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This paper aims to predict the heat transfer and pressure drop for an in-line flat tubes configuration in a cross-flow using an artificial neural network. The numerical study of a two-dimensional steady state and incompressible laminar flow for an in-line flat tube configuration in a cross-flow is also considered in this study. The Reynolds number varies from 10 to 320. Heat transfer coefficient and pressure drop results are presented for tube configurations at three transverse pitches of 2.5, 3.0, and 4.5 with two longitudinal pitches of 3.0 and 6.0. The predicted results for the average Nusselt number and dimensionless pressure show good agreement with previous work. The accuracy between the actual values and the neural network approach model results was obtained with a mean absolute relative error less than 4.1%, 4.8%, and 3.8% for the average Nusselt number, dimensionless pressure drop and average friction factor, respectively.

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Laminar Forced Convection Heat Transfer over Staggered Circular Tube Banks: A CFD Approach

Cited by 25 publications

References 28 publications

Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

Energy analysis of a stepped cascade solar still connected to photovoltaic thermal collector

Heat Transfer and Pressure Drop Prediction in an in-Line Flat Tube Bundle by Radial Basis Function Network

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