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Experimental Investigation of Enhancement of Natural Convective Heat Transfer in Air Using Ultrasound


[ 1 ] Instytut Technologii i Inżynierii Chemicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.6] Chemical engineering
[7.6] Chemical sciences

Year of publication


Published in

Applied Sciences

Journal year: 2023 | Journal volume: vol. 13 | Journal number: iss. 4

Article type

scientific article

Publication language


  • natural convection enhancement
  • airborne ultrasound
  • cooling
  • small Biot’s number conditions

EN One of the methods to improve convective heat exchange is the application of ultrasound assistance. However, little is known about ultrasound application in the air. The main purpose of this study is to investigate the effect of ultrasound on natural convection cooling. The tests are based on the cooling of the metal samples (in four different shapes) preheated to a temperature of 60 ◦C. Cooling takes place in free convection without and with the use of ultrasound at different powers (50 W, 100 W, 150 W, and 200 W). The study uses a mathematical model based on a small Biot’s numberassumption. Thevaluesoftheconvectiveheatexchangecoefficientsaredeterminedbyusing an approximation of the experimental results. The coefficients obtained are an increasing exponential function of the applied ultrasound power. This study indicates the possibility of using ultrasound to improve heat transfer by free convection.

Date of online publication


Pages (from - to)

2516-1 - 2516-13





Article number: 2516

License type

CC BY (attribution alone)

Open Access Mode

open journal

Open Access Text Version

final published version

Release date


Date of Open Access to the publication

at the time of publication

Full text of article

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Ministry points / journal


Impact Factor

2.7 [List 2022]

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