Fluid flow in tubes with helical elements

Review on Recent Progresses in Heat Transfer Enhancement Through the Use of Passive Vortex Generators and Its Applications in Solar Parabolic Trough Systems

“…al. [12] in his investigation further concluded that the helical static element was responsible for producing the secondary flow. Wang and Suden [13] in their series of experiments observed that a wire coil insert performs effectively in enhancing the heat transfer in the turbulent flow region, whereas tape has a poor overall efficiency.…”

“…Ujhidy [12] carried out various experiments by placing wire coil inserts into circular pipe, with water as fluid and explained the flow structure taking place. Wang and Sunden [13] carried out similar experiments and concluded that wire coil proved to be efficient means of heat transfer augmentation technique than twisted tape.…”

Optimization of tube length by CFD analysis for heat transfer of sugar cane juice in a circular pipe using passive heat transfer technique of twisted tape

“…Also they focus on the non zero phase angle in between the segmented TT gives poor results. (Ujhidy et al,2003) studied the laminar flow with water coils and tubes containing TT and helical static elements. They results into a modified Dean number due to the curvature of the spherical line cut out by the helical element.…”

Reduced fouling and enhanced microbial inactivation during online sterilization of cheese whey using UV coil reactors in series

“…The secondary flow started to develop in the coil reactors at values of Reynolds number less than 20. Ujhidy et al [38] reported that in coiled tubes with helical elements of L/d between 1.0 and 1.5, and Reynolds numbers between 20 and 50, a secondary flow is expected to develop if the critical Deans number is larger than 11.6-20. The results obtained from this study indicated that as the flow rate increased, the magnitude of secondary flow increased and as a result Dean number increased.…”