Heat transfer coefficient and friction factor correlations for the transitional flow regime in rib-roughened rectangular ducts

Karwa, Rajendra; Solanki, S.C.; Saini, J.S.

doi:10.1016/s0017-9310(98)00252-x

Cited by 224 publications

(74 citation statements)

References 29 publications

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“…And similarly the angle of twisting the obstacle or angle of incidence is selected on the basis of creating turbulence. The range of Reynolds number is selected on the basis of the air flow rates reported in the literature [14,15] for solar air heater and on the capacity of the blower used.…”

Section: Methodsmentioning

confidence: 99%

Effects of Delta-Shaped Obstacles on the Thermal Performance of Solar Air Heater

Bekele

Mishra

Dutta

2011

Advances in Mechanical Engineering

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An experimental investigation has been carried out to study the effect of delta-shaped obstacles mounted on the absorber surface of an air heater duct with an aspect ratio 6 : 1 resembling the conditions close to solar air heaters. This study encompassed the Reynolds number (Re) ranging from 3400 to 27600, longitudinal pitch of the obstacle (P l /e) varied from 3/2 to 11/2, and relative obstacle height (e/H) varied from 0.25 to 0.75. The relative obstacle transverse pitch (P t /b) = 7/3 and the angle of attack of flow on obstacle = 90• are kept constant during the whole experimentation. By comparing the heat transfer data obtained from the obstacle-mounted duct with that of smooth duct under similar geometrical and flow conditions, the obstacle-mounted duct enhances the heat transfer by 3.6-times at Re = 7276.82, P l /e = 3/2, and e/H = 0.75.

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Section: Methodsmentioning

confidence: 99%

Effects of Delta-Shaped Obstacles on the Thermal Performance of Solar Air Heater

Bekele

Mishra

Dutta

2011

Advances in Mechanical Engineering

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“…In various chemical process plants like heat exchanger, most heat transfer frequently utilized mode is forced convection. Ribs, wires, or grooves are welded on the surface to get roughness elements to improve heat transfer [1,2].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Forced Convection Heat Transfer for SiO2 flow through Channel with Ribs at Constant Heat Flux

Ahmed

Nawaf

2018

int.jour.sci.res.mana

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Numerical investigation of forced convective flow in a 2-dimensional microchannel. This investigation is analyzed with nanoparticles SiO 2 and water as a base fluid studying the influence of turbulence model inside multi geometrical channel (Triangular, Trapezoidal, Semi-circular, and Rectangular) by using "Finite Volume Method (FVM)". The heat flux is applied on the lower wall of channel and the upper is insulated. The diameter of nanoparticles is 20 nm. The Reynolds number ranges are from 10000 to 30000 for ratio of groove width (B) to channel height (H) was used 0.75. The volume fractions range is between 1-4%. Triangular channel score higher Nusselt number and lower friction factor than other cases against Reynolds number. When the volume fraction was increase, the Nusselt number increased and friction factor decreased, this gives 4% has the optimal properties.

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“…Although numerous studies on the SAHs efficiency improvement have been reported by experimental and numerical work for heat transfer mechanism inside [4,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

Labed¹,

Moummi²,

Benchabane³

et al. 2015

IJHT

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This paper presents an experimental comparative study on the thermal performance and heat exchange of two single pass solar air heaters models (SAHs); we have proceeded to reversing the flow direction in the solar air heater. Initially, to determine the best performing model and to improve the efficiency factor of the SAH. Secondly, to evaluate the convective heat transfer coefficient of both models, named: N-1 and N-2. The indices (1) and (2) indicate, respectively, that the air was blown up or blown down in the channel duct of the SAH. Therefore, we have compared between the efficiencies, the convective heat transfer coefficient, Nusselt number curves and the distribution of air temperatures in the channel ducts of both solar air heaters. Both collectors were designed, constructed and tested in the University of Biskra (Algeria) in a stand facing south at an inclination angle equal to the local latitude. The results show that N-2 model (air blown down) is more efficient than N-1 model (air blown up), and the improvements in the heat exchange due to this technological solution are about 10-20%.

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Heat transfer coefficient and friction factor correlations for the transitional flow regime in rib-roughened rectangular ducts

Cited by 224 publications

References 29 publications

Effects of Delta-Shaped Obstacles on the Thermal Performance of Solar Air Heater

Effects of Delta-Shaped Obstacles on the Thermal Performance of Solar Air Heater

Enhancement of Forced Convection Heat Transfer for SiO2 flow through Channel with Ribs at Constant Heat Flux

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

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