Finite element solution to transient asymmetric heat conduction in multilayer annulus Research
This study investigate the heat transfer and thermal stresses for the time-dependent asymmetric heat conduction in a multilayer annulus by using finite element method. The realistic problem of isotropic multilayer annulus subjected to heat flux with internal heat generation and initial temperature is solved. The results of temperature and thermal stress have been computed numerically, illustrated graphically and interpreted technically. These results may be used in many engineering problem like combustion chamber, electric generator, compressor, hydraulic pumps etc. MSC: 35G30 • 35K20 • 74S05 • 80A20 • 80M10
Thermal stress analysis due to surface heat source Research
The present manuscript deals with the heat transfer and thermal stress analysis of cylinder due to internal heat generation under steady temperature conditions. The internal heat generation is taken as cylindrical surface heat source in annular region of linear length of cylinder and is situated concentrically inside the cylinder. The upper surface of a cylinder is subjected to arbitratory temperature whereas the lower surface and circular boundary surface are thermally insulated. The integral transform methods are used for the solution of non-homogeneous boundary value problem. The theory of linearized thermoelasticity based on solution of Navier’s equation in terms of Goodier’s thermoelastic displacement potential, Michell’s function and the Boussinesq’s function for cylindrical co-ordinate system have been used for discussion and analysis of thermal stresses. MSC: 00A79 • 01A08 • 34B60 • 35K50
Effects of reservoir volume on performance of pulse tube cooler.
A pulse tube cooler has the advantages of long-life and low-vibration over conventional cryocoolers such as G-M and Stirling coolers because of the absence of moving parts at low temperature. On the other hand, the combination of a reservoir and orifice is indispensable to optimize the performance of pulse tube coolers. In order to make the pulse tube cooler compact for practical applications, the volume of reservoir should be minimized. This paper analyzes the effects of the reservoir volume on the thermodynamic performance of various components in a simple orifice and a double-inlet pulse tube cooler by combining a linearized model with a thermodynamic analysis. Expressions of entropy production for those components are presented. The results show that the reservoir volume has a significant influence on the entropy production in the various components when the reservoir to pulse tube volume ratio is smaller than about 5. The ratio is important to determine the minimum reservoir volume for a pulse tube cooler. Optimum settings for a double-inlet pulse tube cooler are also discussed.