Search

This paper considers the heat transfer process between solid particulates with heat source and gaseous heat transfer carrier in airlift apparatus during the pneumatic transportation. This case has many important practical applications in heat transfer systems where heat is generated within or absorbed by the particulate. Examples of such processes include drying processes, chemically reacting systems, and combustion processes. The two most important parameters in the thermal treatment of solid particulates in this case are the temperatures of solids and the gaseous heat carriers. Traditionally, these temperatures are considered as functions of x-ordinate along the heat transfer duct of the apparatus. Such an approach leads to the subsequent difficulties because it is necessary to solve simultaneously the differential equations of particulates and gaseous heat transfer carrier motion and the equations of heat transfer. This paper considers a deviation from this traditional approach and presents a set of differential equations in which the parameter is a heat transfer surface of the particulates. This approach reduces the number of differential equations describing the process and significantly simplifies the analytical formulation of the problem and hence the solution itself. The provided solutions allow for determining the temperatures of both the solids and the gaseous heat carriers as a function of particulate heat transfer surface. Two specific cases addressed here are heat transfer and heat and mass transfer when heat is generated within or absorbed by the particulates.Copyright © 2002 by ASME

This paper is deals with the development of an innovative pneumatically operated injection valve for liquid molding applications. The work in this paper was carried out in a senior design project of one of the authors. A specialized pneumatically operated valve to eliminate the manual step of tubing removal has been designed, fabricated and tested. To evaluate this valve, special test equipment was designed and fabricated, and a specific procedure for testing was developed. The results obtained from the testing indicated that the valve works properly according to the established specification and requirements, and passed air leak checks at different inlet and outlet configurations. The proposed valve is very unique since it allows the catalyzed resin to flow into the mold cavity when it is opened. It allows cycle flushing of the solvent and air into a waste receptacle when it is closed. From the testing and understanding the functionality of the developed valve, it is determined that pneumatically operated injection valve is a viable component that could be used in a production environment to further enhance productivity.