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Register a new userImproving the performance of heat exchanger surface by industrial roughness
تحسين الأداء لسطح تبادل حراري مخشن صناعيا
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من أكثر التقنيات المستخدمة في تحسين الأداء لسطح تبادل حراري هي في زيادة خشونة هذا السطح, فالسطح الخشن يهدف إلى تحفيز الاضطراب مما يؤدي إلى زيادة معامل انتقال الحرارة, كما يؤدي إلى زيادة مساحة سطح التبادل الحراري في الوقت نفسه حيث بينت بعض التقارير أن السطوح غير الملساء المخشنة لها عامل حمل حراري أكبر بـ 55% إلى 100% من السطوح الملساء. هذا البحث يهدف بشكل أساسي لاختبار مقدار التحسن في انتقال الحرارة بالحمل من سطح تبادل حراري مخشن صناعياً بواسطة أداة خاصة تصنع تشوهات دقيقة اصطناعية منتظمة بمقاطع مختلفة, والتي تؤدي إلى زيادة مساحة سطح التبادل الحراري وبالتالي زيادة كمية الحرارة المتبددة من هذا السطح مقارنة مع سطح أملس غير مخشن. أظهرت النتائج أن لا حاجة لتطبيق مقاطع الخشونة المختلفة على سطح التبادل بمستويين متعامدين وانما يكفي تطبيق هذه المقاطع بمستوي واحد ونحصل على نفس الزيادة في مساحة سطح التبادل. كما تظهر النتائج أيضاً الى أن مقاطع الخشونة السطحية المنتظمة ذات المقطع المستطيل تعطي أفضل زيادة في المساحة.
One popular heat transfer augmentation technique involves the use of rough surfaces of different configurations. The rough surface aims to promote surface turbulence that is intended mainly to increase the heat transfer coefficient and surface area. It was reported that non-flat surfaces have free convection coefficients that arrive to 50% to 100% more than those of flat surfaces. The goal of this study aims mainly to examine heat transfer enhancement from a surface with same industrial roughness created by a special tool (roughness surfaces) with different shapes under convection heat transfer compared to equivalent smooth surfaces without deformations. The results show there is no need to apply the different roughness configurations in two mutually perpendicular directions. It's enough to cause it only in one plane. And we have got the same win in surface area. The results show also the rectangular profiles of roughness give the best result.
References used
Al-Essa, A.H.; AL-Hussien, F.M.S., 2004- The effect of orientation of square perforations on the heat transfer enhancement from a fin subjected to natural convection. Heat and mass transfer vol 40, p.509-515
Al-Essa, A. H., 2000- Enhancement of thermal performance of fins subjected to natural convection through body perforation. Ph.D. thesis, Department of Mechanical Engineering, University of Baghdad, Iraq and University of science and technology of Jordan
AL-Essa, A. H., 2006- One Dimensional Finite Element Solution of the Rectangular Fin with Rectangular Perforations. wseas transactions on heat and mass transfer ,Issue 10, Volume 1, p762-768
Bergles, A., Technique to augment heat transfer. In Handbook of heat transfer Applications. ( Edited by Werren M.Rohsenow; James P.Hartnett, and Ejup N.Ganic), Ch.3, second Edition, McGraw – Hill Book company, NY
Fan, J.F.; Ding, W.K.; He, Y.L.; and Tao, W.Q., 2009- A performance evaluation plot of enhanced heat transfer techniques oriented for energy-saving. International Journal of Heat and Mass Transfer, Vol. 52, pp. 33-44
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This study aims mainly to determine the temperature distribution
heat transfer enhancement under natural convection experimental,
from three surfaces with industrial roughness created by a special
machine (roughness surfaces) with triangular, trapezoidal, spherical
configuration compared to equivalent smooth surface.
With cross-sectional area.
سطح مخشن
سطح أملس
معامل انتقال الحرارة
Rough surfaces
Smooth surfaces
Enhanced heat transfer
Heat transfer coefficient
Convection heat transfer
Temperature distribution
التوزيع الحراري
التبدد الحراري
التحسن في انتقال الحرارة
انتقال الحرارة بالحمل الطبيعي
تحسين انتقال الحراراة
بروزات
مقاطع
heat dissipation
ribs
configurations
المزيد..
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roughness of
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Twenty seven experiments were carried out on samples of Al-
6061, using the full factorial design method with three
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each parameter.
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in the industrial engineering companies in the Syrian coast , The
importance of these methods and they are large
role that its playing in
making scientific and logical decisions to solving problems, which faces
decision makers in these companies. These methods provide a set of
alternatives that help decision makers to choose the best alternative
among these available alternatives to solve the problem that face them,
this reflects positively on the performance of these companies, and their
role on industry.
This research with additives of kaolin is
being carried out in order to improve different types of clay soil. It was
studied the nature and extent of the change on final product.
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