Heat transfer and fluid flow analysis of artificially roughened ducts having rib and groove roughness

Aharwal, K. R.; Pawar, C. B.; Chaube, Alok

doi:10.1007/s00231-014-1292-6

Cited by 21 publications

(5 citation statements)

References 11 publications

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“…The combination of ribs with grooves produced considerably higher thermal performance than the grooves alone. Aharwal et al [24] investigated heat transfer enhancement using combination of wedge ribs with grooves. They concluded that the wedge-groove case showed more heat transfer enhancement compared to the ribonly case.…”

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confidence: 99%

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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%

“…2. If the grooves were too close to the rib, the effect of flow drawing toward grooves was hindered as grooves remained suppressed under the wake region [24]. The groove had an apex angle and depth of 60 deg and 2 mm, respectively.…”

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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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“…Various researchers [79][80][81][82][83][84][85][86][87][88][89][90][91] have examined the heat and fluid flow features created by compound rib-groove elements of different configurations, sizes, and orientations as an artificially roughened heated plate, as summarized in Table 3.…”

Section: Combined Ribs and Groovesmentioning

confidence: 99%

“…Aharwal et al 86 utilized an integrated turbulator in the shape of integrated wedge ribs with grooves to evaluate their influences on the heat transmission and fluid flow features in the range of Re from 3000 to 18,000. To assess the Nu and friction factor improvements, the roughness characteristics related to groove location (

g/P

), wedge angle (

\varnothing

) were adjusted across a broad range.…”

Section: Compound Passive Techniques For Heat Transfer Improvementmentioning

confidence: 99%

Compound passive heat transfer augmentation techniques: A comprehensive review

Al‐Chlaihawi,

Hasan,

Ekaid

2023

Heat Trans

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The function of energy is becoming increasingly vital in meeting the requirements of modern societies and sustaining rapid economic and industrial growth globally. Heat transfer equipment has been employed for heat recovery and conversion in various domestic and industrial applications. Therefore, due to the recent global energy crisis, boosting the thermal efficiency of energy systems has become an essential requirement, which would reduce both their size and rates of energy demand. There are active and passive methods for boosting heat transfer rates. As they have no moving components, passive methods are more affordable and dependable than active ones. Applying two or more passive techniques concurrently will result in a higher heat transmission rate than any approach working independently. The current article comprehensively reviews experimental and computational investigations of passive compound forced convection heat transfer augmentation techniques at laminar, transition, and turbulent flow regimes. This article focuses on compound techniques arrangement in the form of turbulators, typical twisted tapes (TTs), surface roughness, vortex generators, and so on. The pioneering research suggests that using a lower twist ratio, lower pitch, and smaller winglet angles in TTs can result in higher heat transfer rates, albeit with a slightly increased friction factor. The combination of alternate‐axes and wings in TTs leads to more effective heat transfer enhancement within the tube.

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“…Previous studies were often done at low Reynolds numbers or were just providing integral data. Also in most experiments additional roughness elements like grooves or ribs are used, for example see [1][2][3]. Other experiments investigated a fully turbulent high aspect ratio duct flow with smooth and rod-roughened walls using hot-wire anemometry, but don't provide any information about the heat flux, see [12].…”

Section: Introductionmentioning

confidence: 99%

Lifetime Experiments of Regeneratively Cooled Rocket Combustion Chambers and PIV Measurements in a High Aspect Ratio Cooling Duct

Hötte

Günther

Sethe

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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This paper aims at experimental investigations of the life limiting mechanisms of regeneratively cooled rocket combustion chambers, especially the so called doghouse effect. In this paper the set up of a cyclic thermo-mechanical fatigue experiment and its results are shown. This experiment has an actively cooled fatigue specimen that is mounted downstream of a subscale GOX-GCH$$_{\text {4}}$$ combustion chamber with rectangular cross section. The specimen is loaded cyclically and inspected after each cycle. The effects of roughness, the use of thermal barrier coatings, the length of the hot gas phase, the oxygen/fuel ratio and the hot gas pressure are shown. In a second experiment the flow in a generic high aspect ratio cooling duct is measured with the Particle Image Velocimetry (PIV) to characterize the basic flow. The main focus of the analysis is on the different recording and processing parameters of the PIV method. Based on this analysis a laser pulse interval and the window size for auto correlation is chosen. Also the repeatability of the measurements is demonstrated. These results are the starting point for future measurements on the roughness effect on heat transfer and pressure loss in a high aspect ratio cooling duct.

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Heat transfer and fluid flow analysis of artificially roughened ducts having rib and groove roughness

Cited by 21 publications

References 11 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

Compound passive heat transfer augmentation techniques: A comprehensive review

Lifetime Experiments of Regeneratively Cooled Rocket Combustion Chambers and PIV Measurements in a High Aspect Ratio Cooling Duct

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