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International Journal of Engineering، جلد ۳۴، شماره ۴، صفحات ۱۰۰۸-۱۰۱۵
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عنوان انگلیسی Experimental Investigation on the Effect a Rotational Shaft on the Thermal Behavior of a Circular Tube under Constant Heat Flux
چکیده انگلیسی مقاله Active and passive methods are two main mechanisms of heat transfer improvement. The active methods use external forces to improve heat transfer. This investigation evaluates the thermal and frictional behavior of a circular tube containing a rotational shaft. Constant heat flux was exerted to the circular tube. The fluid inlet and outlet temperature as well as wall temperature of tubes were measured to calculate the hat transfer coefficient. The Re (Reynolds) number was between 800-2000. Also, the dimensionless rotational speed (Rs) had the values of 1,1.5, 2, 2.5 and 3. Results revealed that the rotational shaft could increase the Nu number. Up to %18. Also, the results showed that the rotational shaft could significantly increase the pressure drop and friction factor. The maximum increment of %78 was achieved for friction factor. It was revealed that the use of rotational shaft could be more efficient at low Re numbers and low dimensionless rotational speeds. Also, it was found that by the increment of Reynolds number and being in the transient regime the efficiency of the system would improve.
کلیدواژه‌های انگلیسی مقاله Dimension less rotational speed,Nusselt Number,friction factor,Thermal efficiency factor
نویسندگان مقاله G. Rahimi |
Mechanical Engineering Department, Technical Education Faculty, Urmia University, Urmia, West Azerbaijan, Iran

S. Jafarmadar |
Mechanical Engineering Department, Technical Education Faculty, Urmia University, Urmia, West Azerbaijan, Iran

I. Mirzaie |
Mechanical Engineering Department, Technical Education Faculty, Urmia University, Urmia, West Azerbaijan, Iran

نشانی اینترنتی https://www.ije.ir/article_127834_04d94de3cda54503470179b9a4a14ec5.pdf
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