Heat transfer and friction factor correlations for a solar air heater duct roughened artificially with multiple v-ribs

Hans, V.S.; Saini, R.P.; Saini, J.S.

doi:10.1016/j.solener.2010.02.004

Cited by 342 publications

(99 citation statements)

References 29 publications

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“…Singh et al [2] performed an experimental investigation by varying roughness pitch (P) using five different rib pitch-to-height ratio (P/e) 4 -12 on the thermohydraulic performance of V-down with gap roughened solar air heater. Hans et al [3] carried out experimental investigation on multiple V-shape roughened absorber plate solar air heater. Kumar et al [4] use multiple V-shaped ribs with the gap as roughness geometry and obtained maximum enhancement of Nu and f of 6.74 and 6.37 times respectively.…”

Section: IImentioning

confidence: 99%

“…Ho et al [7] Collector efficiency of double pass SAH is evaluated. Han et al [8] seen the effect of artificial roughness on heat transfer and friction factor for two opposite roughened surfaces. Mukesh Kumar et al [9] A comprehensive theoretical analysis to evaluate thermal (Ƞth) and thermohydraulic (Ƞeff) efficiency of arc shaped roughened solar air heater has been done.…”

Section: IImentioning

confidence: 99%

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Experimental Analysis of Double Flow Solar Air Heater by using Multiple Arc Shape Baffle as Artificial Roughness- A Review

Ray¹

2018

IJRASET

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In the present paper, a comprehensive investigation on solar air heater for heating air having circular wire rib with artificial roughness in the form of arc shape on the back side of absorber plate, has been carried out. Artificial roughness used on the absorber plate is efficient method to improve performance of solar air heater. In present investigation on performance calculation of Solar Air Heater with arc shaped wire rib with artificial roughness absorber plate has been carried out by mathematical model and it is compared with a plane absorber Solar Air Heater. Multiple arc shaped ribs of double flow gives better heat transfer. All the parameters in this investigation has been decided on the basis of practical consideration of the system and operating condition of solar air heaters. In this investigation the parameters are taken such as relative roughness height(e/d) and angle of attack(α/90) have been studied on Nusselt number(Nu) and friction factor(f) with Reynolds number(Re) varies from 2000 to 17000.

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Section: IImentioning

confidence: 99%

Section: IImentioning

confidence: 99%

Experimental Analysis of Double Flow Solar Air Heater by using Multiple Arc Shape Baffle as Artificial Roughness- A Review

Ray¹

2018

IJRASET

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“…Theoretical and experimental investigations of an elliptical heat pipe flat plate solar collector were performed by Sivakumar et al [4]. Forced convection heat transfer in smooth and roughened rectangular ducts has been studied extensively in references [5][6][7][8][9]. Ekramian [1] studied numerically the effect of riser shape on the thermal efficiency, finding a collector with circular tubes, had 38.4%, 11.2%, and 6.6% greater thermal efficiency than collectors with triangular, square, and hexagonal ducts respectively.…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of laminar forced convection in a solar collector with non-circular duct

Teleszewski

2017

E3S Web Conf.

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Abstract. This paper presents a two-dimensional numerical study to investigate laminar flow in a flat plate solar collector with non-circular duct (regular polygonal, elliptical, and Cassini oval shape) featuring forced convection with constant axial wall heat flux and constant peripheral wall temperature (H1 condition). Applying the velocity profile obtained for the duct laminar flow, the energy equation was solved exactly for the constant wall heat flux using the Boundary Element Method (BEM). Poiseuille and Nusselt numbers were obtained for flows having a different number of geometrical factors. The results are presented and discussed in the form of tables and graphs. The area goodness factor and volume goodness factor are calculated. The predicted correlations for Poiseuille and Nusselt numbers may be a very useful resource for the design and optimization of solar collectors with non-circular ducts.

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“…Other investigations explored the effect of continuous ribs in various arrangements such as: angled rib [6], V-rib [9,10], discrete V-rib [11][12][13][14][15], multi V-rib [16] and arc-shaped rib [17]. Use of inclined ribs resulted in the improvement of heat transfer as compared to the transverse ribs.…”

Section: Introductionmentioning

confidence: 99%

“…V-shaped ribs were believed to improve the span-wise distribution of heat transfer by doubling the counter-rotating secondary flow regions [11][12][13][14][15]. Multi V-shaped ribs further improved the thermal performance due to the increase in the density of counter-rotating secondary flow vortices [16]. Application of the ribs with gaps was reported to improve the heat transfer performance due to the refreshment of the secondary flow through the gaps while moving along the inclined ribs and acceleration of the flow while passing through the gaps, thereby interrupting the growth of the boundary layer downstream the nearby reattachment zone; on the other hand, the friction factor was reported to be less than the continuous counterparts of these ribs.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis on the Thermal Hydraulic Performance of an SAH Duct with Multi V-Shape Roughened Ribs

Kumar

Kim

2016

Energies

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This study presents the heat transfer and fluid flow characteristics in a rib-roughened SAH (solar air heater) channel. The artificial roughness of the rectangular channel was in the form of a thin circular wire in discrete multi V-pattern rib geometries. The effect of this geometry on heat transfer, fluid flow, and performance augmentation was investigated using the CFD (computational fluid dynamics). The roughness parameters were a relative discrete distance of 0.69, a relative rib height of 0.043, a relative rib pitch of 10, a relative rib width of 6.0, and a flow-attack-angle of 60˝. The discrete width ratios and Reynolds numbers ranged from 0.5 to 2.0 and from 2000 to 20,000, respectively. The CFD results using the renormalization k-epsilon model were in good agreement with the empirical relationship. This model was used to investigate the heat transfer and fluid flow characteristics in the multi V-pattern rib roughened SAH channel. The thermo-hydraulic performance was found to be the best for the discrete width ratio of 1.0. A discrete multi V-pattern rib combined with dimple staggered ribs also had better overall thermal performance compared to other rib shapes.

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Heat transfer and friction factor correlations for a solar air heater duct roughened artificially with multiple v-ribs

Cited by 342 publications

References 29 publications

Experimental Analysis of Double Flow Solar Air Heater by using Multiple Arc Shape Baffle as Artificial Roughness- A Review

Experimental Analysis of Double Flow Solar Air Heater by using Multiple Arc Shape Baffle as Artificial Roughness- A Review

A numerical investigation of laminar forced convection in a solar collector with non-circular duct

CFD Analysis on the Thermal Hydraulic Performance of an SAH Duct with Multi V-Shape Roughened Ribs

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