Entropy generation in water based natural circulation loop

[+] Author and Article Information
Sugun Tej Inampudi

Department of Mechanical Engineering Birla Institute of Technology & Science Pilani Rajasthan-333031, India

Baji Marthi

Department of Mechanical Engineering Birla Institute of Technology & Science Pilani Rajasthan-333031, India

Satyabrata Sahoo

Department of Mechanical Engineering Indian Institute of Technology (ISM) Dhanbad Jharkhand-826004, India

1Corresponding author.

ASME doi:10.1115/1.4039764 History: Received August 21, 2017; Revised March 14, 2018


Natural circulation loop (NCL) based secondary fluid systems are simple, reliable and inexpensive due to the absence of any moving components such as pumps. Water based NCLs are widely used in applications such as solar collectors, nuclear reactors, etc. Also, most of the studies on natural circulation loops do not consider the 3-dimensional variation of the field variables. In the subject work, 3-D steady flow simulation of water based, single-phase rectangular natural circulation loop (NCL) with isothermal source and sink have been carried out to study the effects of different design and operating parameters such as loop height, temperature lift, in plane and out of plane tilt angles on the rate of heat transfer and the rate of entropy generation due to both fluid flow and heat transfer. Rate of entropy generation due to both heat transfer and fluid flow for turbulent flow regimes in a natural circulation loop is calculated for a wide range of design and operating parameters. In turbulent flow regimes the rate of entropy generation due to fluid flow is significant although rate of entropy generation due to heat transfer is dominant. All the above-mentioned design and operating parameters have significant effect on rate of entropy generation and rate of heat transfer as well. With increases in loop height and temperature lift, rate of entropy generation increases. As the tilt angle increases in XY plane, the rate of the entropy generation initially increases but after certain tilt angle it starts decreasing.

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