Continuous sheet, heat transfer

External Dilute-Phase Upflow Cooler. The external ddute-phase upflow design (68) offers some control in the range of heat removal duties but generates relatively low heat-transfer coefficients [60—170 W/(m K)]- This design substantially increases the surface area requirement and thereby reduces the ultimate duty that can be achieved from a single bundle. In addition, poor mechanical rehabdity has been continuously experienced because of excessive erosion at the lower tube sheets as a result of the high catalyst fluxes and gas velocities imposed. 

Cylinder Heat-Transfer Units Sometimes called can dryers or drying rolls, these devices are differentiated from drum diyers in that they are used for solids in flexible continuous-sheet form, whereas drum dryers are used for liquid or paste forms. The construction of the individual cyhnders, or drums, is similar in most respec ts to that of drum diyers. Special designs are used to obtain uniform distribution of steam within large drums when uniform heating across the drum surface is critical. 

Continuous vulcanisation of rubber based products such as thin conveyor belting, flooring and similar can be achieved using a large rotating heated drum. Pressure is exerted to the product by means of a continuous stainless steel belt which presses the sheet to the surface of the drum. The belt is also heated from its reverse side to give optimum heat transfer to the vulcanising rubber. 

Bulk Polymerization. This involves only monomer, initiator, and perhaps chain-transfer agent. It gives the greatest polymer yield per unit of reactor volume and a very pure polymer. However, in large-scale batch form, it must be run slowly or in continuous form with a lot of heat-transfer area per unit of conversion to avoid mnaway. Objects are conveniendy cast to shape using batch bulk polymerization. Poly(methyl methacrylate) glazing sheets are produced by batch bulk polymerization between glass plates. They are also made by continuous bulk polymerization between polished stainless steel... 

Film-type fill is most often utilized in countercurrent designs. Here, the fill consists of multiple vertical surfaces through which hot water flows in the form of continuous thin films or sheets. The cooling air passes over these films effecting heat transfer. 

Heat Transfer to Opaque and Moving Continuous-Sheet Multimode and Conjugate Heat Transfer Effects. In the previous discussion, convective heat transfer coefficients were obtained from empirical correlations. Therefore, coupling between convection and radiation... 

M. V. Karwe and Y. Jaluria, Numerical Simulation of Thermal Transport Associated with a Continuously Moving Flat Sheet in Rolling or Extrusion, in H. R. Jacobs (ed.), Proceedings of the National Heat Transfer Conference, HTD-Vol. 96, pp. 37-45, ASME, New York, 1988. 

A. M. Jacobi, A Scale Analysis Approach to the Correlation of Continuous Moving Sheet (Backward Boundary Layer) Forced Convective Heat Transfer, J. Heat Transfer, 115, pp. 1058-1061,... 

Khan, 2006) studied the case of the boundary layer problem on heat transfer in a viscoelastic boundary layer fluid flow over a non-isothermal porous sheet, taking into account the effect a continuous suction/blowing of the fluid, through the porous boundary. The effects of a transverse magnetic field and electric field on momentum and heat transfer characteristics in viscoelastic fluid over a stretching sheet taking into accoimt viscous dissipation and ohmic dissipation is presented by (Abel et al., 2008). (Hsiao, 2007) studied... 

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