Heat transfer and friction factor correlation for inclined spherical ball roughened solar air heater

• Autorzy: Murmu Ramesh , Kumar Parmanand , Singh Hari N.

Identyfikatory

DOI

10.24425/ather.2020.132958

• Języki publikacji: EN

Abstrakty

EN

Flow mechanism under roughened solar air heater is quite complex. This paper is an effort towards determining the governing equations for heat transfer and friction factor for inclined spherical balls roughened ducts. With the availability of these equations, it is easier to predict the thermal and thermohydraulic performance of such roughened solar air heaters. The governing equations are derived based on the experimental data generated under actual outdoor condition at the test rig designed and fabricated at the terrace of the Mechanical Engineering Department, the National Institute of Technology Jamshedpur in India, in terms of roughness and flow parameters. Maximum augmentation in Nusselt number and friction factor for varying relative roughness pitch, relative roughness height, spherical ball height to diameter ratio, and angle of attack was respectively found to be of the order of 2.1 to 3.54 times, 1.87 to 3.21 times, 2.89 to 3.27 times and 1.74 to 3.56 times for Nusselt number and 0.84 to 1.79 times, 1.46 to 1.91 times, 1.67 to 2.34 times and 1.21 to 2.67 times for friction factor in comparison to non-roughened duct. The optimum roughness parameters under present investigation have been found.

Słowa kluczowe

EN

renewable energy; spherical ball; relative roughness pitch; relative roughness height; Nusselt number; friction factor; angle of attack

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2020
• Tom: Vol. 41, no 2
• Strony: 3--34
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wykr., wz.

Twórcy

autor

Murmu Ramesh

• National Institute of Technology, Department of Mechanical Engineering, Adityapur, Jamshedpur, Jharkhand 831014, India

autor

Kumar Parmanand

• National Institute of Technology, Department of Mechanical Engineering, Adityapur, Jamshedpur, Jharkhand 831014, India

autor

Singh Hari N.

• National Institute of Technology, Department of Mechanical Engineering, Adityapur, Jamshedpur, Jharkhand 831014, India

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