کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7059205 1458088 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Piezoelectric translational agitation for enhancing forced-convection channel-flow heat transfer
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Piezoelectric translational agitation for enhancing forced-convection channel-flow heat transfer
چکیده انگلیسی
Piezoelectric translational agitator (PTA) is proposed and its heat transfer performance is demonstrated by experiments in a narrow channel. For the present study, this channel simulates a portion of an air-cooled heat sink. An oval loop shell structure successfully generates millimeter-range translational displacement to a blade attached to the shell. A PTA operating at 961 Hz as its second resonance mode with a 1.4 mm displacement under 60 Liters Per Minute (LPM) of cross flow achieved about 55% improvement in heat transfer coefficient compared to the non-agitated state. Pressure drop in the test section and the corresponding power required to drive the flow through the channel against the oscillating blade were measured. In addition, the PTAs were tested in the open channel without through-flow to examine the sole effect of agitation and to investigate the possibility of using it as a stand-alone cooling device. A total Reynolds number was defined to characterize the combined effects of cross flow and agitation. The Stanton number developed from the relationship between the total Reynolds number and heat transfer coefficients enables predicting operating performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 25–26, December 2012, Pages 7398-7409
نویسندگان
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