Forced convection in non-circular tubes with non-linear viscoelastic fluids including viscous dissipation

Investigation of turbulent entropy production rate with SWCNT/H2O nanofluid flowing in various inwardly corrugated pipes

“…These hybrid heat transfer fluids have been found to possess high thermal conductivity compared with the base fluid and also have some advantages over conventional heat transfer fluids, which include higher heat conduction rate, lower pumping power, stability, and among others. 3,4 Various works on the enhancement of CHTP using geometry modification such as the usage of ribs, 5,6 vortex generator, [7][8][9] wavy channel, 10,11 twisted tape inserts, [12][13][14] corrugated tube, [15][16][17] noncircular cross-section, [18][19][20] helical tube, 21 and converging pipe 22 have been reported in the literature. In addition, among the various geometry modifications examined so far, the inwardly corrugated pipe is preferable due to its high thermal efficiency and ease of maintenance.…”

“…Various works on the enhancement of CHTP using geometry modification such as the usage of ribs, 5,6 vortex generator, 7–9 wavy channel, 10,11 twisted tape inserts, 12–14 corrugated tube, 15–17 noncircular cross‐section, 18–20 helical tube, 21 and converging pipe 22 have been reported in the literature. In addition, among the various geometry modifications examined so far, the inwardly corrugated pipe is preferable due to its high thermal efficiency and ease of maintenance.…”

Rheological Characterization of High-Molecular-Weight Polyethylene Oxide—An Extensive Parametric Experimental Study

“…Hydrophilicity of PEO makes it a good candidate for use as humidity sensors, Sajid et al [7]. (PEO) belongs to the class of non-linear polymeric solutions the nonlinear constitution of which coupled with non-circular cross-sectional geometry, generates secondary flows which in turn significantly enhances heat transfer through the wall, Siginer and Letelier [8], Letelier et al [9], Siginer et al [10,11] and Musil and Zatloukal [12]. Polymeric additives added to the working fluid in the Rayleigh-Bénard convection modify the flow structure and the heat transfer rates in the cell both in laminar, Zheng et al [13,14] and turbulent flows, FE-22-1314- 3 Ahlers and Nikolaenko [15] and Cai et al [16].…”