Turbulent Film Condensation of Pure Vapors Flowing Normal to A Horizontal Condenser Tube - Constant Heat Flux at the Tube Wall

Sharma, K.V.; B., Vijaya Lakshmi; T., Subrahmanyam; V., Dharma Rao

doi:10.15282/ijame.4.2011.7.0037

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…Comprehensive experimental (Zukauskas, 1972), numerical (Jayavel & Tiwari, 2009;Marchi & Hobmeir, 2007;Rahmani, Mirzaee, & Shirvani, 2005;Wang, Penner, & Ormiston, 2000;Wilson & Bassiouny, 2000), and experimental and numerical studies (Matos, Vargas, Laursen, & Bejan, 2004;Sumner, 2010;Rosdzimin, Zuhairi, & Azwadi, 2010) on circular tube banks have been previously conducted. Based on previous studies published in the literature, one can infer from this that the form of a tube and its arrangement has a significant effect on heat transfer (Fowler & Bejan, 1994;Mandhani, Chhabra, & Eswaran, 2002;Vijaya Lakshmi, Subrahmanyam, Dharma Rao, & Sharma, 2011;Suryanarayana, Srinivasa Rao, Reddy Prasad, Sharma, & Sarma,, 2011).…”

Section: Introductionmentioning

confidence: 90%

A Numerical Study of Forced Convection Heat Transfer over a Series of Flat Tubes between Parallel Plates

Tahseen¹,

Ishak²,

Rahman³

2012

J MECH ENG SCI

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This paper presents the numerical study on two-dimensional forced convection heat transfer across three in-line flat tubes confined in a channel under incompressible, steady-state conditions. This system is solved in body-fitted coordinates (BFC) using the finite volume method (FVM). The constant heat flux is imposed on the surface of the tubes as the thermal boundary conditions. The range of the longitudinal pitch-todiameter ratio (S L /D s ) of 2.0-4.0 is considered, the Reynolds number varies within the range 25-300, and the Prandtl number is taken as 0.7. The temperature contours, local Nusselt number distributions at the tube surface and mean Nusselt number were analyzed. The strength of the heat transfer between the surface of the tubes and the air flow increases with an increase in Reynolds number and pitch-to-diameter ratio.

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Section: Introductionmentioning

confidence: 90%

A Numerical Study of Forced Convection Heat Transfer over a Series of Flat Tubes between Parallel Plates

Tahseen¹,

Ishak²,

Rahman³

2012

J MECH ENG SCI

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“…However, the thermal conductivity enhancements of Al 2 O 3 and TiO 2 in water are similar, although the heat transfer enhancement of Al 2 O 3 in water is higher than that of TiO 2 in water. However, two groups found that the heat transfer coefficient of nanofluids (Al 2 O 3 and TiO 2 in water and SiC in water) was lower than for pure water for constant average velocity in a turbulent flow (Ferrouillat, 2011;Vijaya Lakshmi, Subrahmanyam, Dharma Rao, & Sharma, 2012). A hybrid nanofluid was used to enhance the heat transfer and pressure drop in a fully developed laminar flow through a uniformly heated circular tube (Suresh, Venkitaraj, Selvakumar, & Chandrasekar, 2012).…”

Section: Heat Transfer Enhancementmentioning

confidence: 99%

Heat Transfer Enhancement with Nanofluids – A Review

Mohammed¹,

Sharma²,

Bakar³

et al. 2013

J MECH ENG SCI

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This paper presents a review of the studies undertaken on convection heat transfer with nanofluids. Initial studies were directed towards the determination of the properties of nanofluids, especially their thermal conductivity and viscosity. The studies indicate that thermal conductivity and viscosity increase with an increase in the concentration of the nanofluid. Experiments were conducted with different nanofluids, at various concentrations and temperature ranges, for the estimation of the heat transfer coefficient and friction factor for water-based nanofluids. All the studies confirmed enhancement of the heat transfer coefficient with an increase in concentration. The experimental ranges of temperature undertaken by the authors were different for different nanofluids. Certain studies with smaller particle sizes indicated an increase in heat transfer enhancements when compared with values obtained when using larger particle sizes. It is observed that the concentration of the nanofluid, the operating temperature, the particle size and shape, together with the material of the nanoparticle dispersed in the base liquid, have significant influence on the heat transfer coefficient. All the studies indicate a nominal increase in pressure drop.

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“…As reported in the literature, these studies investigate the effects of the different geometries, the change of the dimensions of the bodies and the Reynolds number. In addition to this, the effects of the arrangement types, the number of bodies and the combination of the bodies with different sizes or shapes is also investigated (Akansu, 2004;Ishak, Tahseen, & Rahman, 2013;Satya Narayana, Ramireddy, & Venkataramana, 2011;Tahseen, Ishak, & Rahman, 2012;Vijaya Lakshmi, Subrahmanyam, Dharma Rao, & Sharma, 2011). Bluff body fluid dynamics are widely reported in the literature due to the complexity of the fluid behavior occurring in the back track region of the bodies.…”

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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Turbulent Film Condensation of Pure Vapors Flowing Normal to A Horizontal Condenser Tube - Constant Heat Flux at the Tube Wall

Cited by 11 publications

References 15 publications

A Numerical Study of Forced Convection Heat Transfer over a Series of Flat Tubes between Parallel Plates

A Numerical Study of Forced Convection Heat Transfer over a Series of Flat Tubes between Parallel Plates

Heat Transfer Enhancement with Nanofluids – A Review

Edge Length Effect of Bluff Bodies on Flow Structure

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