Experimental comparison of specific heat capacity of three different metal oxides with MWCNT/ water-based hybrid nanoflu
- PDF / 1,437,860 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 51 Downloads / 171 Views
ORIGINAL ARTICLE
Experimental comparison of specific heat capacity of three different metal oxides with MWCNT/ water‑based hybrid nanofluids: proposing a new correlation Arun Kumar Tiwari1 · Naimish S. Pandya2 · Harshang Shah3 · Zafar Said4 Received: 5 August 2020 / Accepted: 1 October 2020 © King Abdulaziz City for Science and Technology 2020
Abstract The main objective of this study is to investigate three distinct non-commonly used metal oxide-based nanoparticles, i.e., CuO + MWCNT, MgO + MWCNT, and SnO2 + MWCNT with a weight mixture ratio of 80:20 each (by weight ratio) and DI water as a base fluid along with the addition of the CTAB surfactant at 3:2. The study incorporates the effect of varying size, dp (20–50 nm), different temperature range (25–50 °C), and volume concentration range of 0.25–1.5%. After examining the stability of prepared HNF over the 30th day from the preparation day and some of the meticulous experimentation on isobaric heat capacity, a new correlation is developed to predict the specific heat of hybrid nanofluid. Considering various parameters like various volume concentration (φ = 0.25–1.50%) and temperature range (T = 25–50 ℃), specific heat of nanofluid, specific heat of base fluid, density of nanofluid, density of base fluid, and average diameter of used nanoparticles. The developed correlation was with 2.93% and 0.903% maximum and average absolute deviation, respectively. Experimental results show the maximum decrement in specific heat value is about 15.09% compared to base fluid DI water at 25 ℃ and 1.50% volume concentration with an average particle diameter of 20 nm for the MgO + MWCNT (80:20)/water HNF. However, it is found that the rate of decrement decreases with the increase of dp from 20 to 50 nm. From the current experimental results, it is concluded that the usage of HNF on relatively higher temperature significantly influences the overall thermophysical properties such as enhancement in thermal conductivity and decrement in viscosity of the working fluid, by paying the marginal loss in specific heat capacity. Therefore, it recommended that the usage of HNF on higher temperature is more beneficial for critical heat transfer application such as HVAC, effective thermal management of the system, natural and forced convection phenomenon. Keywords Specific heat capacity · Nanofluids · Stability · MWCNT · Hybrid · Metal oxide List of symbols CNT Carbon nanotube SWCNT Single-wall carbon nanotube * Arun Kumar Tiwari [email protected] 1
Mechanical Engineering Department, Institute of Engineering & Technology, Dr. A.P.J. Abdul Kalam Technical University, Uttar Pradesh, Lucknow 226021, India
2
Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India
3
Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
4
Sustainable and Renewable Energy Engineering Department, University of Sharjah, P.O. Box, 27272, Sharjah, United Arab Emirates
Data Loading...
