Thermal-hydraulic characteristics specifics of channels with modified twisted tape inserts


Аuthors

Tarasevich S. E., Yakovlev A. B., Shishkin A. V.

Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia

Abstract

The article presents the literary sources review on the effect of various methods of heat exchange intensifiers modification techniques in the form of twisted tape inserts on heat transfer and hydraulic resistance in various channels. It regards the impact of placement of twisted tapes with a gap between the channel’s wall and the tape; the shortened tape inserts; tapes periodically changing twisting direction; tapes with perforated surface and side incisions; dissected insertions; tapes with deflected in a circumferential direction with delta- type “winglets”, with V-, trapezoidal and rectangular or other shape cutouts at the side surface; tapes with ribs aslant to the tape axis, as well as a pack of several twisted tapes on thermo-hydraulic characteristics. Various modifications of the classical twisted tapes can be directed, first of all, on heat and mass transfer enhancement at one- and two-phase flows, and also on decrease of hydraulic losses and avoidance of polluting adjournment on channel walls. While application of modified twisted insertions as thermal exchange intensifiers, an additional heat emission increase can be achieved up to 2.4 times and more at hydro resistance growth up to 4.7 times compared to the corresponding values for a channel with classical tape. The basic mechanisms allowing the heat exchange intensification in the channels with modified tapes are the flow turbolization, vortex formation in the wall-adjacent area and changing of velocity profile in the channel cross-section. Application of the tape twisted inserts in the channels with continuous and discrete walls roughness is also presented. It was noted, that the flow swirling can both reinforce the roughness affecting the heat transfer and suppress it.

Keywords:

heat and mass transfer enhancement, twisted tape insert, swirling of a flow

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