Heat Transfer in 1:4 Rectangular Passages With Rotation

Abstract

The paper presents an experimental study of heat/mass transfer coefficient in 1:4 rectangular channel with smooth or ribbed walls for Reynolds number in the range of 5000–40,000 and rotation numbers in the range of 0–0.12. Such passages are encountered close to the mid-chord sections of the turbine blade. Normal ribs (e/Dh=0.3125 and P/e=8) are placed on the leading and the trailing sides only. The experiments are conducted in a rotating two-pass coolant channel facility using the naphthalene sublimation technique. For purposes of comparison, selected measurements are also performed in a 1:1 cross section. The local mass-transfer data in the fully developed region is averaged to study the effect of the Reynolds and the rotation numbers. The spanwise mass transfer distributions in the smooth and the ribbed cases are also examined.

Heat Transfer Augmentation Technologies for Internal Cooling of Turbine Components of Gas Turbine Engines

“…Investigations which employ naphthalene sublimation to determine mass transfer generally obtain results which are consistent with heat transfer experiments [216,[238][239][240][241][242][243][244][245][246][247]. However, one drawback of such mass transfer methods is the absence of buoyancy within experiments.…”

“…Figure 27 from Huh et al [104] shows that local area-averaged Nusselt number ratios are affected by variations of the buoyancy parameter in the same approximate qualitative manner as when the rotation number changes. Note that the buoyancy parameter Acharya et al [238] Acharya et al [180] Acharya et al [129] Agarwal et al [239] Al-Hadhrami and Han [184] Azad et al [58] Bons and Kerrebrock [178] Chang et al [231] Chang and Morris [220] Chang et al [221] Chang et al [222] Chang et al [236] Chen and Liou [101] Chiang and Li [185] Cho et al [240] Cho et al [241] Cho et al [242] Dutta and Han [64] Dutta et al [232] Dutta et al [65] Dutta et al [223] Elfert et al [50] Shin et al [66] Fu et al [186] Fu et al [128] Fu et al [187] Griffith et al [208] Griffith et al [209] Hajek and Higgins [188] Hajek et al [189] Hajek et al [263] Han and Zhang [210] Han et al [190] Han et al [211] Harasgama and Morris [224] Hsieh and Hong [225] Hsieh and Liu [191] Hsieh et al [192] Huh et al [104] Huh et al…”

Numerical Calculations on Flow and Heat Transfer in Smooth and Ribbed Two‐Pass Square Channels under Rotational Effects

“…Especially in U-shaped channel, the effect of rotation on the first pass and second pass is different due to the different outward flow and inward flow. Agarwal et al [13] investigated the heat transfer in 1 : 4 rectangular passages with rotation. They performed experimental test on smooth and ribbed walls using the naphthalene sublimation technique.…”