Influence of synthetic air jet temperature on local heat transfer characteristics of synthetic air jet impingement

• Published in: International communications in heat and mass transfer 2022-01, Vol.130, p.105796, Article 105796
• Main Authors: Talapati, R.J., Katti, V.V.
• Format: Article
• Language: English
• Subjects: Local Nusselt number; Synthetic air jet; Synthetic air jet temperature; Thin foil technique
• ISSN: 0735-1933; 1879-0178
• DOI: 10.1016/j.icheatmasstransfer.2021.105796

The influence of synthetic air jet temperature on local heat transfer distribution of a synthetic air jet impinging on a smooth flat surface is investigated experimentally. The actuator frequency (f = 100 Hz to 300 Hz) and jet to orifice spacing (z/d = 1 to 8) is considered for the present study. The local heat transfer study is obtained using thin foil and IR thermal imaging technique. At z/d = 1, the Nusselt number characteristics are found approximately 2 times greater when synthetic air jet temperature is considered as jet air temperature instead of surrounding air temperature for all the frequencies. The experimental results observed that heat transfer distribution is strongly influenced by synthetic air jet temperature especially at lower orifice to jet distance. •Influence of cavity air temperature on synthetic jet is studied experimentally.•Thin foil technique is used to obtain local heat transfer by IR thermal imager.•At low z/d, the influence of cavity air temperature is predominant.•Cavity air temperature is strong dependent on z/d.