Effect of secondary fluid motion on laminar flow heat transfer in helically coiled tubes

Experimental and CFD estimation of heat transfer in helically coiled heat exchangers

“…The curvature of the coil governs the centrifugal force while the pitch (or helix angle) influences the torsion to which the fluid is subjected to. The centrifugal force results in the development of secondary flow (Darvid et al, 1971). Due to the curvature effect, the fluid streams in the outer side of the pipe moves faster than the fluid streams in the inner side of the pipe.…”

Heat Transfer Characteristics and Performance of a Spirally Coiled Heat Exchanger under Sensible Cooling Conditions

“…However, most studies for curved-tubes have been carried out with the helically coiled tube. Dravid et al (1) numerically investigated the effect of secondary flow on the laminar flow heat transfer in helically coiled tubes. Numerical results were compared with measured data in the range in which they overlapped.…”

Simulations of Flow in Curved Tubes

“…Flow patterns in curved tubes have important applications to problems in engineering and aerosol science and technology, for example, heat and mass transfer (Mori and Nakayama, 1965;Dravid et al, 1971;Cheng and Takuma, 1991;Choi and Park, 1994) and analyses of particle movement in curved pipes and aerosol instrumentation (Crane and Evans, 1977;Stober and Hederer, 1978;Martonen, 1982;Willeke and Baron, 1993). Quite different from flow in a straight tube, flow in a curved tube has secondary motion in the plane perpendicular to the axial (i.e., longitudinal) motion of flow, and the axial flow itself is skewed rather than parabolic.…”