Heat transfer at in-line tube bank under low-frequency asymmetrical impulses impact on fluid flow
“Energy supply of manufactures and energy resources saving technology” department, Kazan State Power Engineering University, 420066 Kazan, Russia
Published online: 27 August 2014
External heat transfer coefficient changing from corridor tube bundle to the reverse cross fluid flow with low-frequency asymmetrical pulsations was analyzed experimentally. The experiments were performed for Reynolds numbers in the tube bundle in the range of 100 ≤Re ≤ 500 and changing of flow impulses frequency was limited with values 0.125 ≤f ≤ 0.5 Hz, fluid pulsations amplitude in the tube bundle corresponded to 0.5 d ≤A ≤ 1.2 d mm. A comparison of steady and non-steady conditions was made. The most efficient regime of pulsations in the studied range was found.
© Owned by the authors, published by EDP Sciences, 2014
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