Effect of blockage ratio on pressure drag and heat transfer of a cam-shaped tube
Heat and Mass Transfer, 2016•Springer
An experimental investigation has been conducted to clarify the effects of blockage ratio on
forced convective heat transfer and pressure drag of an isothermal cam-shaped tube in
cross-flow of air. The blockage ratio varies between 1.5≤ H/D eq≤ 7 and Reynolds number
based on equivalent diameter varies in range of 7.5× 10 3 to 17.5× 10 3. Results show that
by increasing blockage ratio from 1.5 to 7, drag coefficient of the cam-shaped tube
decreases about 55% and increasing Reynolds number from 7.5× 10 3 to 17.5× 10 3 results …
forced convective heat transfer and pressure drag of an isothermal cam-shaped tube in
cross-flow of air. The blockage ratio varies between 1.5≤ H/D eq≤ 7 and Reynolds number
based on equivalent diameter varies in range of 7.5× 10 3 to 17.5× 10 3. Results show that
by increasing blockage ratio from 1.5 to 7, drag coefficient of the cam-shaped tube
decreases about 55% and increasing Reynolds number from 7.5× 10 3 to 17.5× 10 3 results …
Abstract
An experimental investigation has been conducted to clarify the effects of blockage ratio on forced convective heat transfer and pressure drag of an isothermal cam-shaped tube in cross-flow of air. The blockage ratio varies between 1.5 ≤ H/Deq ≤ 7 and Reynolds number based on equivalent diameter varies in range of 7.5 × 103 to 17.5 × 103. Results show that by increasing blockage ratio from 1.5 to 7, drag coefficient of the cam-shaped tube decreases about 55 % and increasing Reynolds number from 7.5 × 103 to 17.5 × 103 results in 40–48 % increment in Nusselt number. For better comparison, ratio of pressure drag over heat transfer of cam-shaped tube is compared with circular tube. In all ranges of Reynolds number and blockage ratios, thermal–hydraulic of cam-shaped tube is about 40–171 % greater than circular tube.
Springer
以上显示的是最相近的搜索结果。 查看全部搜索结果