Experimental and numerical analysis for effects of using conical ring on turbulent flow and heat transfer in a double pipe air to water heat exchanger. (5th May 2016)

• Record Type: Journal Article
• Authors: Sheikholeslami, M.; Ganji, D.D.; Gorji-Bandpy, M.
• Is Part Of: Applied thermal engineering. Volume 100(2016:May)
• Page Start: 805
• Page End: 819
• Publication Date: 2016-05-05
• Subjects: Perforated conical ring -- Air to water heat exchanger -- NSGA II -- Pressure loss -- Heat transfer -- CFD; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.02.075
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Effect of conical ring on thermal performance of an air to water heat exchanger is studied. The flow in the inner and outer pipe is turbulent. η is an increasing function of λ and PR . DCR array has higher performance than RCR array. Abstract: Effect of typical and perforated conical ring turbulators on hydrothermal behavior of air to water double pipe heat exchanger is investigated. Two arrays (Direct conical ring (DCR) array and Reverse conical ring (RCR) array) are considered. Experimental analysis is examined for different values of open area ratio (0–0.0833), Reynolds number (6000–12, 000), conical angle (0 ° –30 ° ) and pitch ratio (1.83–5.83). Correlations for friction factor, Nusselt number and thermal performance factor are presented. To reach the optimal design, Non Sorting Genetic Algorithm II is applied. Pareto front of optimized solution is presented. Also the finite volume method (commercial code) is utilized for numerical section in order to show physical phenomena. Results indicate that friction factor reduces with augment of open area ratio, pitch ratio and Reynolds number. Nusselt number reduces with increase of open area ratio and pitch ratio while it augments with enhance of Reynolds number. Also it can be concluded that thermal performance rises with augment of conical angle for direct conical ring array.