ME 4433 Class ProjectSpring 2013Prepared by:Chad ObeidzinskiJared PellegrinProblem StatementThe ocean is a vast and uncharted region of our world today. Over seventypercent of the world is covered by water and there are still areas of scientifcM !!"" Class Pro#ectChad Obeidzinski and Jared Pellegrinconcern. Most of these areas involve very low te$peratures and e%tre$elyhigh pressures& which $akes e%ploration i$possible without the aid ofsub$ersibles. 'ub$ersibles such as ()*+,& a-.'. ,avy.owned /eep'ub$ergence *ehicle&e%plore the oceans today. 0ith the help ofsub$ersiblescientist areabletoe%plore1"2of theglobal ocean3oor4.()*+, can carry one operator and two scientists to depths of !&566 $eters.()*+, is e7uipped ca$eras& high intensity lights& and view ports in order toe%plore the particular environ$ent. (ninterestingproble$ca$eupas ()*+,was selectedto e%ploretherecently discovered hydrother$al vents at the botto$ of the ocean. 0aterfro$thebotto$of theoceanseepsthroughbedrocktoe%tre$elyhighte$peratures in the earth8s core and is heated. This heated water resurfacesthroughventsontheoceans3oor. Theseventsdeposit$ultiple$ineralssuchasgoldandsilver andhost auni7ueenviron$ent forundiscoveredani$als. These vents are literally a hot spot for scientist. (lthough a wealthof knowledgeis heldat thesevents acertaindanger acco$panies thevessels that get near these high te$perature water spouts. +n our Mechanical ngineering 9eat Transferclass we are bestowed with the privilege topredict the heat transfer in the acrylic view portsof the vessel. +n order to do so we were given a$odel of the view port and the ther$alpropertiessurroundingthewindow. :igure4isthe $odel that was given to the )'- 9eatTransfer class. 0e are to assu$e a s7uarewindow with a height of 6."6$ ;9< and a widthof 6.65$ ;0cient of =6 0?$=.@;hi. Thee%ternal te$peratureisat=oCandthete$peratureof thevents e%haust is !66oCwithaconvectionheattransfer coe>cient of 466or =660?$=.@;hw. 0eweretoldthat two$aterials could be used for the view port acrylic or glass. (crylic is currentlyused on the vesseland its propertiesare a k of 6.4A 0?$.@& a density of44A6kg?$"& andaspecifc heat of 4!B6J?kg.@. Class is analternative$aterial and its properties are a k of 4.! 0?$.@& a density of =566 kg?$"&and a specifc heat of B56 J?kg.@. 0ith these properties a su>cient $odel ofthe heat transfer characteristics can be derived.Method Description 0hen any point in the acrylic or glass reaches =66oC the vessel is in danger.+n order to predict the unsteady =/heat transfer the energy balance=ig!re 1 "indo# $eometryM !!"" Class Pro#ectChad Obeidzinski and Jared Pellegrine7uationwas used. Theenergybalancee7uationassu$es the$aterialanalyzed is sectioned and conservation of energy is assu$ed in each controlvolu$e. The center of this control volu$e is called the node. 'ince the actualheat transfer direction is usually unknown it is useful to assu$e all the heatistransferredtothenodes. Therearethree$ainsectionsofinteresttheconvection at the left and right walls& the conduction through the $aterial&and the conduction of the $aterial and the $etal. ( s$all distance nodesensures $ore accurate results& however if the distance is too s$allco$puting the heat transfer to each node will take a long ti$e. Theseparation between each node was decided to be a s7uare of 6.665$ and6.66=5$. Two distances were chosen so the results fro$ each result can beco$pared to see if a s$aller distance would be useful to fully understand theheat transfer. M(T)(D& a nu$eric co$puter solver& was used to co$pute theheat transfer to each node. The $ain point of interest is the center of left wall. This point will be the frstpoint to reach the =66oC $a%i$u$. 0ith that known the code will focus onseeing of this point has reached =66oC.%es!lts(ccording to assu$ptions a variables $entioned in the Proble$ 'tate$entthe vessel would be dee$ unsafe for the $ission. Table 4 illustrates the ti$eit will take for the center of the left wall to reach =66oC. The acrylic would failvery 7uickly and with the large change in ti$e for each node distance + doubtthat this $odel is highly accurate and that a s$aller distance between thenodes is re7uired. The glass however gives $ore ti$e but not by $uch. Thedistance fro$ the nodes see$ to be fne& but as the convection heat transfercoe>cient is raisedMaterialh&al!e'"(m)*+d, - dy&al!e'mm+.ime /orcenter o/ le/t#all to reach200C 's+(crylic4665 "1.=5=.5 4=.B=665 41.!"=.5 A.61Class4665B=.1E=.5 B=.1=665 4E."5=.5 4E.4B"M !!"" Class Pro#ectChad Obeidzinski and Jared Pellegrin0ppendi,M0.102 Code"or3s CitedF9u$an Occupied *ehicle (lvin.F : Woods Hole Oceanographic Institution. ,.p.& n.d. 0eb. == Mar. =64".+ncropera& :rank P.& and /avid P. /e0itt. Introduction to Heat Transfer. ,ew GorkH 0iley& 4AA1. Print.Pawson& /avid. F0hat 0e /O,IT @now (bout the /eep 'ea.F Ocean Portal. ,.p.& 4" July =64=. 0eb. == Mar. =64".!