Adopting standard k-ε turbulent model in conjunction with the wall-surface function method

a three-dimensional numerical calculation for situation of the turbulent flow heat transfer on the shell-side of spirally twisted flat-tube heat-exchanger has been carried out under condition of high Reynolds number

and a comparison with bow-shaped baffle heat exchanger being made.The results of numerical calculation show that: the heat transfer coefficient on shell-side of the spirally twisted flat-tube heat exchanger increases with increasing the Reynolds number

and decreases with increasing the S/de value of said twisted tube;the comprehensive performance index α/ΔP on the shell-side of said twisted tube exchanger is higher

having better effect for strengthening heat transfer.