Heat transfer and pressure drop in furrowed channels with transverse and skewed sinusoidal wavy walls

摘要: Abstract This comparative study examines the detailed Nusselt number (Nu) distributions, pressure drop coefficients (f) and thermal performance factors (η) for two furrowed rectangular channels with transverse skewed sinusoidal wavy walls. Detailed heat transfer measurements over these walls at Reynolds numbers (Re) = 1000, 1500, 2000, 5000, 10,000, 15,000, 20,000, 25,000 30,000 are performed using steady-state infrared thermo-graphic method. Impacts of Re on Nu f tested waviness individually examined. In addition to macroscopic mixing between near-wall recirculations core flows due shear layer instabilities in each channel, secondary tripped by wall-waves further elevate performances distinguish their distributions from those wall. The area-averaged ( ¯ ) 5000  correlations channel is derived as controlling parameter. By way comparing a selection rib-roughened channels, η present compatible roughened compound V-ribs deepened scales relative low penalties equivalent augmentations offered V-ribs.