Influence of rib height on the local heat transfer distribution and pressure drop in a square channel with 90° continuous and 60° V-broken ribs

SriHarsha, V.; Prabhu, S.V.; Vedula, Rajendra P.

doi:10.1016/j.applthermaleng.2008.12.015

Cited by 68 publications

(37 citation statements)

References 13 publications

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“…Numerous previous studies have investigated the parameters influencing rib performance. Ribbed channel flow is typically characterized by rib spacing, height, profile, angle of attack, and configuration [1][2][3][4][5]. In general, the ribs disrupt the flow boundary layer and promote flow mixing between the hot fluid near the wall and cooler main flow core.…”

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confidence: 99%

Heat Transfer and Friction in a Square Channel with Ribs and Grooves

Liu

et al. 2016

Journal of Thermophysics and Heat Transfer

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Turbulence promoters have been widely applied to enhance heat transfer in internal flow channels, although they cause pressure loss. This study employed the transient liquid-crystal technique to measure the heat transfer distribution in a square channel with compound turbulence promoters with orthogonal (90 deg), continuous angled (45 deg), discrete angled (45 deg), V-shaped, and inverted-V-shaped rib configurations. The rib height-to-hydraulic diameter ratio (e∕D h ) and the rib pitch-to-height ratio (P∕e) were 0.1 and 8, respectively. Variations in the Nusselt number were observed after adding grooves between the ribs. The Reynolds number tested in this study ranged from 15,000 to 35,000. Adding grooves between the ribs enhanced the heat transfer. The convective heat transfer coefficient increased by up to 40%, whereas the friction factor ratio increased by less than 30%. The discrete angled configuration of grooved ribs exhibited the maximal heat transfer enhancement and thermal performance, whereas the orthogonal configuration attained the minimal heat transfer enhancement and thermal performance. The frictional loss of the V-shaped and inverted-V-shaped configurations was higher than that of the continuous or discrete arrangements for both ribs-only and ribbed-grooved configurations.

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confidence: 99%

Heat Transfer and Friction in a Square Channel with Ribs and Grooves

Liu

et al. 2016

Journal of Thermophysics and Heat Transfer

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“…Skullong and Promvonge [16] investigated the heat transfer and flow friction characteristics in a solar air heater channel fitted with delta-winglet type vortex generators. Sri Harsha et al [17] and Gupta et al [18] studied the local heat transfer distribution and pressure drop in a square channel and found that the 60° V-broken rib gives the heat transfer higher than the 90° continuous and profiled ones. Tanda [19] investigated the effect of transverse, angled ribs, discrete, angled discrete ribs, V-shaped, V-shaped broken and parallel broken ribs on heat transfer and flow friction.…”

Section: Introductionmentioning

confidence: 98%

Enhanced heat transfer in a heat exchanger square-duct with discrete V-finned tape inserts

Noothong

Suwannapan

Thianpong

et al. 2015

Chinese Journal of Chemical Engineering

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“…The presence of ribs in a closed channel produces a complex flow field due to flow separation and reattachment between the ribs, which increases turbulence level and this leads to an increased heat transfer coefficient. Two vertical walls of the test section were made up of steel having 0.05 mm thickness [1]. Figure 1 shows formation of separation bubble and reattachment produced by ribs.…”

Section: Introductionmentioning

confidence: 99%

Computational study on effects of rib height and thickness on heat transfer enhancement in a rib roughened square channel

Shukla

Dewan

2016

Sādhanā

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A computational study was carried out for the heat transfer augmentation in a three-dimensional square channel fitted with different types of ribs. The standard k-e model and its two variants (RNG and realizable) were used for turbulence modeling. The predictions were compared with available experimental and computational results. Three rib configurations were used in the present study: 90°continuous attached ribs, 60°V -shaped broken attached thick and thin ribs. It was observed that the maximum heat transfer occurs at the normalized rib spacing (p/e) = 10 in the case of 90°attached ribs. The effects of the blockage ratio and rib thickness were investigated for 60°V-shaped broken ribs with Re = 10,000-30,000 and p/e = 10. It was observed that the average Nusselt number decreases with an increase in the Reynolds number for almost all configurations studied in the present study. For the 60°V-shaped broken ribs, increasing the blockage ratio had an adverse effect on the heat transfer. It was also observed that thin ribs perform better than thick ribs.

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Influence of rib height on the local heat transfer distribution and pressure drop in a square channel with 90° continuous and 60° V-broken ribs

Cited by 68 publications

References 13 publications

Heat Transfer and Friction in a Square Channel with Ribs and Grooves

Heat Transfer and Friction in a Square Channel with Ribs and Grooves

Enhanced heat transfer in a heat exchanger square-duct with discrete V-finned tape inserts

Computational study on effects of rib height and thickness on heat transfer enhancement in a rib roughened square channel

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