A Study of Boiling Heat Transfer via an Aqueous Solution of Commercial-Grade Engine Coolant and Pure Water | [Journal of Pakistan Institute of Chemical Engineers • 2024]

Author(s):

1. W. Ahmed: Department of Chemical Engineering, University of Engineering and Technology Peshawar,,Pakistan

2. S. Ali: Department of Chemical Engineering, University of Engineering and Technology Peshawar,,Pakistan

3. N.A. Khan: Department of Chemical Engineering, University of Engineering and Technology Peshawar,,Pakistan

4. N.H. Syed: Department of Chemical Engineering, University of Engineering and Technology Peshawar,,Pakistan

5. U. Ghani: Department of Chemical Engineering, University of Engineering and Technology Peshawar,,Pakistan

Abstract:

Commercial grade motor radiator coolant is a mixture of glycol, corrosion inhibitors, inorganic compounds, and water. These radiator coolant formulations enhance the thermal efficiency and lifespan of combustion engines. In this study we added a radiator coolant solution in a distilled water to investigate potential improvements in the heat transfer rate. Thus, the heat dissipation from a coiled Nichrome wire (electrically operated) was analyzed in open air, pure water, and various concentrations of aqueous coolant solutions. The boiling of coolant aqueous solution at concentrations of 5% wt./wt., 10% wt./wt., 15% wt./wt., and 20% wt./wt. were compared with pure water. In general, a heat transfer coefficient values increases with coolant concentration. For example, at 5% wt./wt., the heat transfer coefficient is 40 W/m²·K, whereas at 20% wt./wt. concentration, it rises to 140 W/m²·K. Moreover, qualitatively the bubble size in pure water is significantly larger than that of bubbles of the coolant solutions. Turbidity and total dissolved solids increase with coolant concentrations, whereas at a 20% wt./wt. concentration, the surface tension decreases to 68.8 mN/m. This study suggests that adding an engine coolant solution into standard boiler feed water or similar cooling system devices will improve the heat transfer rate and therefore reduces fuel cost for producing steam.

Page(s): 17-30

DOI: 10.54693/piche.05223

Published: Journal: Journal of Pakistan Institute of Chemical Engineers, Volume: 52, Issue: 2, Year: 2024

Keywords:

Coefficient of Heat Transfer , Vapor Bubbles , Pool Boiling

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