Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 52 11 2019 10 05 Investigating the Orientation of the Heater and Cooler on the Performance of a Mini Natural Circulation Loop with Cu-Water Nanofluid Investigating the Orientation of the Heater and Cooler on the Performance of a Mini Natural Circulation Loop with Cu-Water Nanofluid 3203 3224 3620 10.22060/mej.2019.16499.6407 FA Seyyed Masoud Seyyedi Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran A.S. Dogonchi Young Researchers and Elite Club, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran Mehdi Hashemi-Tilehnoee Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran Journal Article 2019 06 25 The main objective of this paper is to investigate the effects of the orientation of    heater and cooler on the mass flow rate and temperature distribution in a natural circulation loop. The governing equations of the natural circulation loop – mass conservation, momentum, and energy- are written in the non-dimensional form. Cu-Water nanofluids considered as the working fluid and the effect of nanoparticles percentage on mass flow rate is investigated. Also, the effects of other parameters such as pipe diameter, height of the loop, loop inclination angle and the heater power on the mass flow rate of the loop and temperature distribution are investigated. The results show the mass flow rate increases 43% when the diameter of pipes increases 20% for all orientations of the heater and cooler. For heater power 50 W, the mass flow rate increases 12.8% almost, when the percentage of nanoparticles increases 2%. The mass flow rate increases 22.4% almost as the power heater increases from 20 W to 30 W (50 % increasing) for all orientations. For heater power 20 W and 2% nanoparticles, the temperature at the end of heater (hot leg) for horizontal heater and horizontal cooler and vertical heater and vertical cooler is 34 ºC, and 97 ºC, respectively. The main objective of this paper is to investigate the effects of the orientation of    heater and cooler on the mass flow rate and temperature distribution in a natural circulation loop. The governing equations of the natural circulation loop – mass conservation, momentum, and energy- are written in the non-dimensional form. Cu-Water nanofluids considered as the working fluid and the effect of nanoparticles percentage on mass flow rate is investigated. Also, the effects of other parameters such as pipe diameter, height of the loop, loop inclination angle and the heater power on the mass flow rate of the loop and temperature distribution are investigated. The results show the mass flow rate increases 43% when the diameter of pipes increases 20% for all orientations of the heater and cooler. For heater power 50 W, the mass flow rate increases 12.8% almost, when the percentage of nanoparticles increases 2%. The mass flow rate increases 22.4% almost as the power heater increases from 20 W to 30 W (50 % increasing) for all orientations. For heater power 20 W and 2% nanoparticles, the temperature at the end of heater (hot leg) for horizontal heater and horizontal cooler and vertical heater and vertical cooler is 34 ºC, and 97 ºC, respectively. https://mej.aut.ac.ir/article_3620_4baf54f36935058bcc696fcef3f4689b.pdf