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Authors = Hasan Sajjadi ORCID = 0000-0002-0681-7682

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19 pages, 9920 KiB  
Article
Louvered Fin-and-Flat Tube Compact Heat Exchanger under Ultrasonic Excitation
by Amin Amiri Delouei, Hasan Sajjadi, Meysam Atashafrooz, Mohammad Hesari, Mohamed Bechir Ben Hamida and Ahmad Arabkoohsar
Fire 2023, 6(1), 13; https://doi.org/10.3390/fire6010013 - 31 Dec 2022
Cited by 49 | Viewed by 3927
Abstract
Utilizing ultrasonic excitation as an active method for studying the rate of heat transfer has gained considerable attention recently. The present study investigated the effects of ultrasonic excitation on the heat transfer rate in a fin-and-flat tube heat exchanger experimentally. The performance of [...] Read more.
Utilizing ultrasonic excitation as an active method for studying the rate of heat transfer has gained considerable attention recently. The present study investigated the effects of ultrasonic excitation on the heat transfer rate in a fin-and-flat tube heat exchanger experimentally. The performance of the heat exchanger was investigated with and without the presence of ultrasonic excitation. A comprehensive parameter study was attempted, so several parameters, including ambient temperature, flow rate, air passing velocity, Reynolds number, and Nusselt number, were studied in a relatively wide range. An adequate uncertainty test, as well as a validation assessment, is provided to certify the credibility of the obtained results and the hired facility. The results revealed that reducing the flow rate, ambient temperature, and air passing velocity on the heat exchanger increased the ultrasonic excitation’s effects. The highest heat transfer enhancement in the present experiment was 70.11%, measured at the lowest air passing velocity and ambient temperature with a Reynolds number 2166. The data presented in this paper will be useful for the optimal design of ultrasonic vibrating fin-and-tube heat exchangers. Full article
(This article belongs to the Special Issue Heat Transfer in Fire)
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13 pages, 2485 KiB  
Article
Ultrasonic Vibration Technology to Improve the Thermal Performance of CPU Water-Cooling Systems: Experimental Investigation
by Amin Amiri Delouei, Hasan Sajjadi and Goodarz Ahmadi
Water 2022, 14(24), 4000; https://doi.org/10.3390/w14244000 - 8 Dec 2022
Cited by 55 | Viewed by 5691
Abstract
The rapid growth of the electronics industry and the increase in processor power levels requires new techniques to improve the heat transfer rate in their cooling systems. In this study, ultrasonic vibration technology was introduced as an active method to enhance the thermal [...] Read more.
The rapid growth of the electronics industry and the increase in processor power levels requires new techniques to improve the heat transfer rate in their cooling systems. In this study, ultrasonic vibration technology was introduced as an active method to enhance the thermal performance of water-cooling systems. The effects of ultrasonic vibrations at power levels of 30, 60, and 120 watts for different cooling airflow rates were investigated experimentally. The results were validated with available empirical correlations to ensure the accuracy of the measurement systems. The findings indicated that the ultrasonic vibrations enhanced the heat transfer in the liquid-cooling heat exchangers. In addition, the thermal performance of the ultrasonic vibrations was improved by reducing the airflow rate and increasing the ultrasonic power. In addition to the feature of heat transfer improvement, ultrasonic waves are widely used for the cleaning of different types of heat exchangers. Regarding the anti-fouling and anti-accumulation effects of the ultrasonic vibrations, the introduced technology could provide a practical way for developing high-performance nanofluids-based computer cooling systems. Full article
(This article belongs to the Section Water-Energy Nexus)
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