أعضاء هيئة التدريس - جامعة بنها
Heat transfer enhancement in a tangentially injected swirl flow through a roughened tube
Proceedings of Al-Azhar Eng. 6th Int. Conf. (AEIC2000), • 2000
معلومات البحث
المؤلفون
A. Abdel-Moneim, A.R. El-Shamy and N.S. Berbish
الكلمات المفتاحية
Not Available
المجلة العلمية
Proceedings of Al-Azhar Eng. 6th Int. Conf. (AEIC2000),
الناشر
. (AEIC2000), Vol.7, pp.175-190 , Sept. 1-4,2000.
المجلد
7
العدد
Not Available
الصفحات
175-190
publication.type
International
رابط البحث
Not Available
المواد المرفقة
Not Available
الملخص
ABSTRACT
Heat transfer enhancement and flow friction were experimentally investigated for a
swirl flow that enters tangentially in a tube roughened by a helical wire. The effects of tube
roughness intensity, tangential to total momentum flux ratio and Reynolds number were
studied. Measurements were conducted in a horizontal tube roughened with helical-wires at
two different diameter to pitch ratios of 0.025 and 0.050, respectively, within a range of
Reynolds number from 10103 to 60103, and at different values of the tangential to total
momentum flux ratios of 1.73, 2.94, 3.46 and 5.88, respectively. An enhancement in the heat
transfer coefficient accompanied with excess friction was observed within the investigated
ranges of the different parameters. Also, it was found that the efficiency index is critically
dependent on the roughness Reynolds number, momentum flux ratio and tube roughness
intensity and it is almost less than that for the rough plain tubes. New correlations for Nusselt
number enhancement ratio and the friction factor ratio were obtained as functions of
momentum flux ratio, d/p ratio and Reynolds number .
Heat transfer enhancement and flow friction were experimentally investigated for a
swirl flow that enters tangentially in a tube roughened by a helical wire. The effects of tube
roughness intensity, tangential to total momentum flux ratio and Reynolds number were
studied. Measurements were conducted in a horizontal tube roughened with helical-wires at
two different diameter to pitch ratios of 0.025 and 0.050, respectively, within a range of
Reynolds number from 10103 to 60103, and at different values of the tangential to total
momentum flux ratios of 1.73, 2.94, 3.46 and 5.88, respectively. An enhancement in the heat
transfer coefficient accompanied with excess friction was observed within the investigated
ranges of the different parameters. Also, it was found that the efficiency index is critically
dependent on the roughness Reynolds number, momentum flux ratio and tube roughness
intensity and it is almost less than that for the rough plain tubes. New correlations for Nusselt
number enhancement ratio and the friction factor ratio were obtained as functions of
momentum flux ratio, d/p ratio and Reynolds number .