Session: 11-19-01: Methods in Computational Heat Transfer and Their Applications

Paper Number: 143004

143004 - Time-Dependent Solution of Unsteady Compressible Flow Equations for Nanoscale Heat and Mass Transfer in Wide-Ranging Diverse Applications 

Nuclear field, its application, and potential future uses in enormously diverse areas through on-going advanced research across the world are extremely vast and require development of appropriate advanced tools and methodologies to aid the efforts. This work is one such effort. Fast developing advanced fluidics, including biofluidics, also needs support for diverse applications. While it is recognized that research, study, analysis, prediction, and/or theoretical solutions of advanced fluidics, biofluidics, nanoscale heat and mass transfer, pulsed or pulsating flows, muzzle blasts, and high energy nuclear explosion blast wave propagations are exceedingly complex tasks, it is also recognized that further advances in the state-of-the-art in such areas and related devices and their applications can best be achieved through basic efforts and analysis utilizing insights developed from phenomenological understanding and empirical information. An effort is made here to obtain time-dependent solutions, as none exist. The analytical approach is based on unsteady viscous and heat-conducting compressible flow model as applied to analyzing the highly complex resonance tube heating phenomenon, which follows.

A new innovative stable time-dependent compressible flow solution over the order of nanoseconds is provided here for wide-ranging critically important challenging applications. Specifically, a solution of the highly complex unsteady high speed oscillating compressible flow field inside a cylindrical tube, closed at one end with a piston oscillating at very high resonant frequency at the other end, has been obtained numerically, assuming one dimensional, viscous, and heat-conducting flow, by solving the appropriate fluid dynamic and energy equations. An iterative implicit finite difference scheme is employed to obtain the solution. The scheme permits arbitrary boundary conditions at the piston and the end wall and allows assumptions for transport properties. In successfully predicting the time-dependent results/data, an innovative simple but stable solution of unsteady fluid dynamic and energy equations is provided here for wide ranging research, design, development, analysis, predictions, and industrial applications in solving a variety of complex fluid flow heat transfer problems. The method is directly applicable to pulsed or pulsating flow and wave motion thermal energy transport, fluid-structure interaction heat transfer enhancement, nanoscale heat and mass transfer, diverse range of advanced fluidics, biofluidics / bioengineering, and fluidic pyrotechnic initiation devices. It can further be easily extended to cover muzzle blasts and high energy nuclear explosion blast wave propagations in one dimensional and/or radial spherical coordinates with or without including energy generation / addition terms. No other solution exists for such wide-ranging critically important diverse applications.

Presenting Author: Ramlala Sinha Applied Engineering Consultants

Presenting Author Biography: President, Senior Executive, Director of Engineering, IT and Software Development Manager, Multi-Program Manager of Diverse Range of Large Critically Important High-Priority National Programs, Research and Development Engineer, Senior Scientist, Developed Numerous Computer Codes / Software Programs, Authored Numerous Scientific and Technical Publications, etc.

Authors:

Ramlala Sinha Applied Engineering Consultants