Showing 3 results for Ghasemian
M. Eftekhar, A. Keshavarz, A. Ghasemian, J. Mahdavinia,
Volume 3, Issue 1 (3-2013)
Abstract
Running the industrial components at a proper temperature is always a big challenge for engineers. Internal
combustion engines are among these components in which temperature plays a big role in their
performance and emissions. With the development of new technology in the fields of ‘nano-materials’ and
‘nano-fluids’, it seems very promising to use this technology as a coolant in the internal combustion
engines. In this study, a nano-fluid (Al2O3-Water/Ethylene Glycol (EG)) is used as an engine coolant along
with an optimized heat exchanger to reduce the warm-up timing. The effect of nano-fluid concentration is
considered here by using their corresponding governing equations, such as momentum and energy. The
engine coolant thermal behavior calculation is carried out based on the lumped method. The obtained
results indicated that using different percentage of nano-fluid mixtures (by volume), such as Al2O3-
Water/EG as engine coolant enhances the heat transfer coefficient and reduces the warm-up timing which,
in turn, results in reduced emissions and fuel consumption.
A. Ghasemian, A. Keshavarz, H. Sotodeh,
Volume 4, Issue 1 (3-2014)
Abstract
The subjects of heat transfer and cooling system are very important topics in the Internal Combustion Engines (ICE). In modern cooling systems, low weight, small size and high compactness are the critical designing criteria that requires heat transfer enhancement. Boiling phenomenon which is occurred in the water jacket of the ICE is one of the methods to increase heat transfer in the coolant system of an ICE. A research has been shown that parameters such as material, temperature, and roughness of the heated surface have direct effect on the rate of heat transfer in a boiling phenomenon. In this paper the potential of boiling phenomenon and the effect of the surface roughness on the amount of heat flux removed by the coolant flow in the engine water jacket is investigated experimentally. For this purpose the experiments was carried out in three different flow velocities and also three different surface roughnesses. Results show that the boiling and roughness of a hot surface will increase the heat removal significantly.
Seyyed Hamed Tabatabaei, Saeed Moradi Haghighi, Amirhossein Kiani, Kasra Ghasemian,
Volume 11, Issue 2 (6-2021)
Abstract
In this paper, an optimized insulator for sound packaging of the vehicle dash panel is proposed. The combination of the micro perforated panel and porous layers has been selected to insulate the dash panel of a vehicle. The main advantages of the mentioned combination are light weight and various tunable parameters in comparison with other insulators. These provide significant flexibility to achieve an optimal performance for the noise attenuation of the vehicle cabin. Therefore, the parameters of the selected sound package have been optimized in order to achieve suitable sound absorption in a selected frequency range. Furthermore, the Genetic Algorithm (GA) is used to optimize the parameters. It can achieve more reliable and more accurate outcomes compared to the conventional method. Full vehicle SEA (Statistical Energy Analysis) simulations are used to evaluate the optimized sound package. The results indicate that the optimized concept has maximum sound absorption capability. Consequently, the proposed sound package improves the vehicle's engine noise reduction by 5 dB in comparison with un-optimized sample in mid and high frequency ranges.
