6638

6189

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1390

xvii ،81ص.: مصور، نمودار

ص.ع. به فارسي و انگليسي

محمدرضا سليم پور

احمد صابونچي

5/2/91

علي اكبر عالم رجبي، احمد صداقت

1396/10/12

كتابنامه

مكانيك

مهندسي مكانيك

ID6189

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

85 Constructal Optimization of Fins used for Cooling a Plate by Free Convection Meisam Maleki m maleki@me iut ac ir Date of Submission 2011 12 27 Department of Mechanic Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mohammad Reza Salimpour salimpour@cc iut ac irAbstract The heat that transferred through conduction in a body should be discharged through convection processfrequently In continuous years heat and fluid science has tried to find characteristics of the transfer invariety configurations This information is vital for designing and analyzing of the system But the problemis that there are many constraints and one of the most important of them is space measure volume weight The goal is always to transfer much more heat in a specific space But the active temperature might be morethan the desired temperature Whereas the function of this equipment has a direct relevance withtemperature it is very important to keep the equipment at an acceptable temperature Sometimes it isrequired to cool a hot plate or keep it in a constant temperature without using forced convection heattransfer In this case it sounds a good way to use fin in free convection heat transfer In the present study the goal is to optimize free convection heat transfer from a finned hot plate Many different algorithms andmethods are used in optimizations One of these methods is constructional theory Unlike thermodynamicoptimization in which we try to have a unique balance for minimum irreversibility between heat transferfunction and fluid mechanics function in constructal theory the goal is to find a pattern in which both ofthese functions reach the highest possible level By using constructal theory we can get fins geometry suchas height and thickness number of the fins and their positions to transfer maximum heat from them withconsidering specific constraints These constraints are temperature of the hot plate mass of the materialwhich we decide to make fins from degrees of freedom including thickness of the fins height of the fins degree of the hot plate with azimuth and distance of the fins from each other For theoretical solution freeconvection heat transfer relation and intersection of asymptotes method are used In addition to theoreticalsolution the problem also was solved numerically and both results was analyzed and compared to eachother Finally the optimized structure was gotten In one case thickness of the fins was considered constantand their height and distance between them were optimized In the other case smaller fins were locatedamong the other fins to use the unheated space among them In these two cases the results of solution withintersection of asymptotes method and numerical solution with computer aid were coincided incontinuance the effect of dimension on increasing heat transfer from fins and optimized geometry wasinvestigated In surveying the angel of the base plate with azimuth two different cases were considered Inone case the base plate had fin and in the other case it did not have any fins In addition the difference ofheat flow rate between the plate and fins was studied in two cases Keywords finned plate free convection heat transfer geometric optimization constructal theory intersection of asymptotes

محمدرضا سليم پور

احمد صابونچي

علي اكبر عالم رجبي، احمد صداقت