INTENSIFICATION OF THE HEAT TRANSFER THROUGH CORRUGATED WALL

Donka STOEVA

Abstract

The corrugation of the smooth steel tubes increases the heating surface per length unit. The advantages compared to smooth pipe bodies are the lower relative mass at same thermal power and the smaller volume. The aim of the present research is to trace the temperature alteration near to a specially corrugated wall with baffles. The baffles have variable step towards the flow direction at two different  heights.  We  observe  developed turbulent  air  flow  at  temperature  353К  (80oC)  through  a corrugated  tube  with  inside  diameter  d=0.08m  and  length  0.2m.  The  tube  wall  is  heated  to  453K (180oC). The heat transfer between the tube and the flowing fluid has been modulated at two different corrugation grades of the tube – Х 1  and Х 2  – equation (9) and with four different Reynolds numbers.

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