Romanian Journal of Information Science and Technology (ROMJIST)

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:
Academician Dan Dascalu

Secretariate (office):
Adriana Neagu
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsors:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro
• Association for Generic
and Industrial Technologies (ASTEGI), www.astegi.ro

ROMJIST Volume 21, No. 4, 2018, pp. 406-428, Paper no. 610/2018
 

P. Indira PRIYA, P. CHANDRAMOHAN, A. KANNAN
Fuzzy logic approach for temperature analysis in multi-jet air impingement investigation

ABSTRACT: In the present work, an experimental investigation was carried out to study the influence of design parameters of impinging air jets on heat transfer, temperature and Nusselt number in a multi-jet air impingement system. Studies have been conducted to see the effect of parameters such as type of nozzle, area of nozzle, Reynolds number and H/D ratio on the heat transfer characteristics. Square, triangle and circular type nozzles with area 8, 10 and 12 mm2 were used for the analysis considering Reynolds number 18000, 20000 and 22000. The H/D ratio used was 2D, 4D and 6D. Taguchi based design of experiment approach with L27 orthogonal array was used to design the experiments. Grey relational analysis is used to optimize the multiple responses and the uncertainty in the experimental data is handled using fuzzy logic technique. The complexity, vagueness and softness in the experimental data are eradicated using fuzzy rules and hence the deductive inference based on rules is used for effective decision making. The investigation reveals that the type of nozzle contributes the most towards overall performance with contribution of 86% followed by area of nozzle, H/D ratio and Reynolds number respectively. A significant improvement in experimental data is observed with the application of fuzzy logic technique.

KEYWORDS: Multi-jet air impingement, heat transfer, Fuzzy logic, Grey relational analysis

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