Parametric optimisation of supercritical CO2 thermal-hydraulic characteristics in microchannels using response surface methodology

Rao, N.T. and Oumer, A. N. and Noor, M. M. and Kadirgama, K. and Basrawi, F. and Siregar, J. P. (2023) Parametric optimisation of supercritical CO2 thermal-hydraulic characteristics in microchannels using response surface methodology. Australian Journal of Mechanical Engineering, 21 (3). pp. 894-910. ISSN 1448-4846. (Submitted) (Submitted)

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This study aims to determine the optimum geometrical and operating parameters of supercritical carbon dioxide (ScCO2) flow through a straight pipe for enhanced heat transferusing the Response Surface Method (RSM). Inlet pressure, inlet temperature, mass flow rate, and pipe inner diameter are selected as design variables while Nusselt number (Nu) and pressure drop are chosen as response functions. The ranges of the input variables considered in the study are inlet pressures (7–10 MPa), inlet temperature (35–80 °C), mass flowrate (0.02–0.05 kg/s), and tube inner diameter (2.8–4.5 mm). The accuracy and validity of the developed mathematical models are validated by comparing the simulation results with published experimental values. The sensitivity analysis results of Nu indicated that the best heat transfer in ScCO2 cooling is found to be associated with the lowest inlet pressure and temperature, the lowest tube diameter, and the highest mass flow rate. Moreover, the best flow conditions with minimum pressure drop are associated with the highest and lowest inlet pressure and temperature, respectively, as well as the highest tube diameter and lowest mass flow rate. These parameter combinations could help reduce the pumping power associated with a high pressure drop.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Heat exchanger; Heat transfer; Numerical simulation; Pressure drop; Response surface methodology (rsm); Supercritical carbon dioxide
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Faculty/Division: Centre for Sustainability of Ecosystem & Earth Resources (Earth Centre)
Faculty of Chemical and Process Engineering Technology
Faculty of Civil Engineering Technology
Faculty of Computing
Faculty of Electrical and Electronic Engineering Technology
Faculty of Manufacturing and Mechatronic Engineering Technology
Faculty of Mechanical & Manufacturing Engineering
Centre for Research in Advanced Fluid & Processes (Fluid Centre)
Centre for Design & Innovation of Technology (PRInT)
Centre for Software Development & Integrated Computing (Software Centre)
Depositing User: Mr Muhamad Firdaus Janih@Jaini
Date Deposited: 13 Sep 2023 01:45
Last Modified: 13 Sep 2023 05:37
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