Experimental and numerical investigation of heat and fluid flow in a square duct featuring criss-cross rib patterns

Singh, Prashant; Ji, Yongbin; Ekkad, Srinath V.

doi:10.1016/j.applthermaleng.2017.09.036

Cited by 49 publications

(9 citation statements)

References 45 publications

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“…Prashant Singh, et al [44] experimentally and numerically conducted a study using an inline and staggered Criss-Cross inclined rib with the Re no ranging from 30,000 to 60,000. The result declared by the author showed that best Nusselt number in a duct was achieved in the ranges of 2.7 and 3.1 for inline and staggered methods of the rib and that the best thermal hydraulic performance achieved between 1.2 and 1.5.…”

Section: Criss-cross Pattern Formed By 45 • Angled Ribmentioning

confidence: 99%

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

et al. 2018

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In this paper, the effect of various shapes of ribs used in Solar Air Heaters (SAHs) was discussed. The review is concentrated on the geometry of the rib and its location on the SAH panel. Both numerical and experimental works were considered for discussion with dry air and Nano fluids as a working fluid. The influence of various shapes, such as an L shape, W shape, V shape, Multiple V shape, V shape with a gap, detachable & attachable ribs etc., was analyzed. The common fact observed from this analysis is that the implementation of artificial roughness in the absorber plate results in a considerable increase in the rate of heat transfer. Further, it is observed that ‘Multiple V-shaped with open between the ribs’ results in the maximum thermal enhancement when compared to the other shapes.

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Section: Criss-cross Pattern Formed By 45 • Angled Ribmentioning

confidence: 99%

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

et al. 2018

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“…Recent numerical studies [10][11][12][13][14][15][16][17][18][19][20][21][22][23] have concentrated on the secondary flow triggered by ribs orientated 45 °and their influences on heat transfer. Lei et al [12] examined the influences of p/e on the thermal performance in a rotating two-pass channel with an AR = 2 1.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Thermohydraulic Performance in a Double Passage Square Duct with the Use of Inclined Ribs of 45°: A Comparative Computational Study

Kaplan

2024

International Journal of Energy Research

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The modern gas turbines need to run at very high inlet temperature to promote their power output. Thus, improvements in cooling technologies play a significant role for enhancing the gas turbine blade life. In this paper, thermohydraulic performance (THP) of a two-pass square channel with inclined ribs at 45° was scrutinized employing the k–ε realizable model with enhanced wall treatment in ANSYS Fluent. The calculations were performed for the rib pitch to height ratio (p/e) of 5-10, rib height to hydraulic diameter ratio (e/Dh) of 0.1-0.2, and Reynolds number (Re) of 20,000-40,000. Detailed analysis of the flow structure in a double passage square duct was carried out to understand the interaction of the rib and bend-induced secondary flows and its contribution to heat transfer enhancement for the rib configurations with distinct p/e and e/Dh, which was not available in any other existing numerical or experimental investigations. The results revealed that the ribs with higher e/Dh generated the stronger stream-wise secondary flows which led to the augmentation of the cooling performance with the disadvantage of pressure loss increment. The maximum THP of 26.55% was achieved with the ribbed configuration having p/e=5 and e/Dh=0.1 at Re=20,000. The new correlations were developed from the computational data to predict the normalized Nusselt number and friction factor (Nu/Nu0 and f/f0, where 0 is the correlation), taking the e/Dh and flow Re into consideration.

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“…Also, the pressure loss in 1 : 2 AR channel with same hydraulic diameter as 2 : 1 AR channel was found to be 60% less. Prashant et al [12] using an AR 1 : 1 channel studied the effect of criss-cross pattern rib turbulators positioned in an inline and staggered configurations. They concluded that heat transfer enhancement was nearly same for inline and staggered configurations; however, friction for inline configuration was lower than staggered configuration.…”

Section: Introductionmentioning

confidence: 99%

Influence of Narrow Rectangular Channel ( $AR = 1 : 4$ ) on Heat Transfer and Friction for V- and W-Shaped Ribs in Turbine Blade Applications

Krishnaswamy

Suresh

Ali

2021

International Journal of Photoenergy

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Effective cooling of blades with a nominal pressure drop is essential for performance augmentation and thermal management of gas turbines. Hence, present work is aimed at determining the heat transfer enhancement and friction for W- and V-shaped ribs inside a rectangular cooling channel having hydraulic diameter ( D h ) of 0.048 m and aspect ratio ( AR ) 1 : 4. Ribs are fixed facing downstream with angle of attack ( α ) 45° on opposite walls. Pitch ( P ) between two successive ribs is 25 mm for both cases. Continuous V- and W-shaped ribs with height to channel hydraulic diameter ratio ( e / D h ) 0.052 and 0.0416 and pitch to height ratio ( P / e ) 10 and 12.5, respectively, have been examined for Reynolds number ( Re ) range 20000-80000. Heat transfer augmentation achieved at Re 80000 is 1.94 and 1.8 times higher than Re 20000 for V- and W-shaped ribs, respectively. Streamwise and spanwise variations in local Nusselt number ratio are highest for V-shaped ribs, which are estimated to be 31% and 12%. For W-shaped ribs, variations are 17.5% and 3.5%. Nusselt number ( Nu ) is highest along span length 0.5 w for V-shaped ribs due to dominance of apex induced secondary flow. For W-shaped ribs, Nusselt number along the span lengths is found to be nearly same view uniformity in secondary flow. Maximum enhancement ( Nu / N u o ) estimated for both the rib shapes is 3.9 at Re 20000. Due to increased rib height, friction losses for V-shaped ribs are higher than W-shaped ribs. Maximum friction loss increment is estimated to be 85% for V-shaped ribs and 42% for W-shaped ribs between Re 20000 and 40000. For both rib shapes, impact of ribs is found to be greatest at Re 40000. Thermohydraulic performance ( THP ) for W-shaped ribs is superior to V-shaped ribs. Best THP achieved for W- and V-shaped ribs are 3.7 and 3.4 at Re 20000.

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Experimental and numerical investigation of heat and fluid flow in a square duct featuring criss-cross rib patterns

Cited by 49 publications

References 45 publications

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

Enhancement of the Thermohydraulic Performance in a Double Passage Square Duct with the Use of Inclined Ribs of 45°: A Comparative Computational Study

Influence of Narrow Rectangular Channel ( $AR = 1 : 4$ ) on Heat Transfer and Friction for V- and W-Shaped Ribs in Turbine Blade Applications

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Experimental and numerical investigation of heat and fluid flow in a square duct featuring criss-cross rib patterns

Cited by 49 publications

References 45 publications

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

Enhancement of the Thermohydraulic Performance in a Double Passage Square Duct with the Use of Inclined Ribs of 45°: A Comparative Computational Study

Influence of Narrow Rectangular Channel ( AR = 1 : 4 ) on Heat Transfer and Friction for V- and W-Shaped Ribs in Turbine Blade Applications

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Influence of Narrow Rectangular Channel ( $AR = 1 : 4$ ) on Heat Transfer and Friction for V- and W-Shaped Ribs in Turbine Blade Applications