Heat Transfer Enhancement in Turbulent Flow Through a Circular Tube With Various Arrangements of a Delta Winglet Vortex Generator

Shoshe, Arif Mahmud Shuklo; Ahmed, Rasel; Sarkar, Mrinmoy

doi:10.1615/interjenercleanenv.2015015661

Cited by 2 publications

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“…However, VGs which have been proven to be highly productive in enhancing heat transfer in rectangular duct SAH systems are yet to be fully explored in triangular duct SAH. 19 The VGs generate longitudinal vortices at elevated turbulence levels which augment the heat transfer. However, the corresponding pressure drop is also higher, and the geometry selection and orientation of VG plays an important role in limiting the pressure drop.…”

Section: Performance Enhancement Techniques For Sahmentioning

confidence: 99%

“…However, the corresponding pressure drop is also higher, and the geometry selection and orientation of VG plays an important role in limiting the pressure drop. [19][20][21] Punching holes on the VG surface has been shown to reduce flow obstruction. 22,23 The flow also accelerates through the holes and subsequently impinges on the absorber surface in the downstream region.…”

Section: Performance Enhancement Techniques For Sahmentioning

confidence: 99%

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Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

Pramod,

Madhwesh,

Arunachala

et al. 2024

Heat Trans

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Thermohydraulic performance augmentation using turbulence promotors is a commonly adopted technique in solar air heater (SAH) applications. This article presents the thermohydraulic performance augmentation of triangular duct SAH using semi‐conical vortex generators (SCVG) using computational fluid dynamics and experimental methodology for various flow Reynolds numbers ranging from 6000 to 21,000. An in‐depth parametric analysis is undertaken to establish the influence of flow attack angle, relative longitudinal pitch, relative transverse pitch and cone diameter of SCVG on the thermohydraulic performance as indicated by the thermohydraulic performance parameter (THPP). The results reveal that the SCVG generates longitudinal vortices and introduces flow impingement zones which significantly affects the flow and heat transfer characteristics of air heaters. Correlations for Nusselt number and friction factor are established, which predicts the performance outcomes with an average error of 6.74% and 4.46%, respectively. The optimal THPP is determined to be 1.74 using artificial neural network model and Bonobo Optimization algorithm. The SCVG produces THPP values well above unity for the entire flow Reynolds number range of 6000–21,000.

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Section: Performance Enhancement Techniques For Sahmentioning

confidence: 99%

Section: Performance Enhancement Techniques For Sahmentioning

confidence: 99%

Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

Pramod,

Madhwesh,

Arunachala

et al. 2024

Heat Trans

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One-Dimensional Transient Model of Food Product Temperature and Weight Loss Evolution in a Vacuum Cooler With Membrane Humidification

Paña,

Berana

2024

Inter J Ener Clean Env

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A one-dimensional, transient model was developed to predict the temperature and weight loss evolution of a food product cooled using a vacuum cooling system with membrane humidification. The model included the following: (1) a sub-model based on the mass conservation of air and vapor inside the vacuum chamber; (2) a sub-model based on the coupled mass and heat transfer with inner vapor and heat generation; and (3) a sub-model based on the mass conservation of water vapor along the flow channels inside the humidifier. The vacuum chamber pressure was reduced from 1 atm to 2200 Pa using a vacuum pump with deflating speed of 500 m3/hr and condenser and membrane humidifier operating temperatures of 13°C and 60°C, respectively. A meat joint with a weight of 5.30 kg was cooled from an initial core temperature of 74°C to below 10°C. The conventional and modified models both cooled the food product to 10°C in 25 minutes. It was found out that increasing the chamber relative humidity reduced the surface water evaporation while the internal evaporation rate remained the same. Thus, the meat's moisture content, which was initially at 73.51%, was reduced to only 65.44%-an improvement from the conventional vacuum cooling system's 64.31%. This translated to product weight loss of only 10.98%, which represented significant progress compared to the conventional system's 12.51%. The simulation results indicated that employing humidification in a vacuum cooling system reduces the product total moisture loss while maintaining the rapid cooling rate.

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Heat Transfer Enhancement in Turbulent Flow Through a Circular Tube With Various Arrangements of a Delta Winglet Vortex Generator

Cited by 2 publications

References 0 publications

Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

One-Dimensional Transient Model of Food Product Temperature and Weight Loss Evolution in a Vacuum Cooler With Membrane Humidification

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