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Borse, Sachin L.
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Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Experimental Investigation of Forced Convection Heat Transfer Enhancement in Dimpled Tube Apet, Vilas P.; Borse, Sachin L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 35 No 1 (2016): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v35i1.402

Abstract

The development of high-performance thermal systems has stimulated interest in methods to improve heat transfer. Tubes with artificial roughness obtained by providing dimples on the tube surface are competitive in comparison to performance and cost of other enhanced techniques currently employed in turbulent flow. In this study forced convection heat transfer characteristics from dimpled tube has been investigated experimentally. The effect of variation in dimple diameter and dimple arrangement (inline and staggered) has been investigated for Reynolds No range 12000 to 26000 dimpled tube. Additionally the effect of variation in dimple tube and diameter on pressure drop across test section has also been investigated. This investigation was carried out to observe if the use of dimples on tube can enhance heat transfer characteristics without severe penalties associated with pressure drops for turbulent flow. The results show that heat transfer enhancement under forced convection can be achieved by using dimple tubes. The enhancement in convective heat transfer coefficient is observed as 18% and in Nusselt number as 22 % as compared with plain tube for same Reynolds number. The thermal performance factor values for the staggered dimpled array geometry were more than corresponding inline dimpled array geometry in the Reynolds number range studied .
Prediction of Flow Distribution in Cooled Gas Turbine Blade with Ribs, Pin-Fins and Film Cooling Holes in Leading Edge Passage Borse, Sachin L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 38 No 1 (2016): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v38i1.394

Abstract

Modern gas turbine blade is internally cooled to maintain its temperature at safe level. Prediction of mass flow distribution in cooling passage of the turbine blade helps in predicting turbine blade temperature during the design stage. In this current paper, commercial software FLUENT 6.2 is used to predict mass flow distribution in the gas turbine blade cooling passages (like leading edge passage, serpentine passage, trailing edge passage, lateral ejection, tip and film cooling holes) with standard k-e and RNG k-e turbulence models. Model suitable to solve such problem requires huge computational resources. Although present model are not suitable for the problem considered but will help to get approximate results and will also indicate capability of CFD. Results are compared with experimental results. Result showed good agreement of predicted mass flow distribution with experimental results. RNG k-e model shows slight improvement in prediction of the supply pressure over other two models.
Co-Authors Apet, Vilas P.