不同材质花瓣形扁通道内翅换热管的实验研究

通过实验的方法研究了一种花瓣形扁通道内翅换热管的对流换热和阻力特性，拟合了所测Re范围内对流换热和阻力实验关联式，并运用相同质量流量、相同泵功率和相同阻力降这3种准则比较了采用不同材质时翅片管与普通光管之间的传热效果。结果表明，翅片材质对换热强化效果有较大影响，无论采用哪种材质，花瓣形扁通道内翅管均有较强的换热效果，特别是在低盅条件下，强化效果更加明显。

Experimental Study of Internally Finned Heat Exchange Tubes Made of Different Materials and with Petal-shaped Flat Channels

Through an experimental method studied was the convective heat exchange and resistance-characteristics of internally finned heat-exchange tubes with petal-shaped flat channels.A fitting of the experimental correlation of convective heat exchange and resistance within the range of measured Reynolds number was carried out.Moreover,by employing the three criteria of equal mass flow rate,equal pump power and equal resistance compared was the heat transfer effectiveness of finned tubes and ordinary bare tubes when different materials were used.It has been found that the material used for the fins has a relatively great influence on heat-exchange intensification effectiveness.However,irrespective of the kinds of materials used,internally finned tubes with petal-shaped channels enjoy relatively high heat exchange effectiveness.The intensification effectiveness is especially conspicuous under the condition of a low Reynolds number.