In this work laminar, stratified flow boiling of water is simulated qualitatively by the coupled map lattice (CML) method. The liquid is entering a constant wall temperature horizontal tube ( at ) in a subcooled condition. A CML is a dynamical system with discrete-time, discrete-space, and continuous states. The procedure basically consists of the following steps: (i) Choose a set of macroscopic variables on a lattice; (ii) decompose the problem into independent components, such as convection, diffusion, phase change, and so on; (iii) replace each component by a simple parallel dynamics on a lattice; and (iv) carry out each unit dynamics successively in each time step until some termination criterion is satisfied. In the present problem, the termination criterion is the laminar-turbulent transition, and hence, the results do not correspond to the steady state. The present modeling by CML is based on the assumption that the flow boiling is governed by (i) nucleation from cavities on the heated surface and migration of vapor into the core, (ii) forced convection, and (iii) phase change in the fluid bulk and mixing. The stirring action of the bubbles is modeled by increasing the fluid momentum and thermal diffusivities by an enhancement factor. The results show that the CML has been able to model flow boiling in a realistic manner.
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December 2007
This article was originally published in
Journal of Heat Transfer
Technical Briefs
A Coupled Map Lattice Model of Flow Boiling in a Horizontal Tube
P. S. Ghoshdastidar,
P. S. Ghoshdastidar
Mem. ASME
Department of Mechanical Engineering,
e-mail: psg@iitk.ac.in
Indian Institute of Technology Kanpur
, Kanpur, U.P. 208016, India
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Indrajit Chakraborty
Indrajit Chakraborty
Department of Mechanical Engineering,
e-mail: indrac@iitk.ac.in
Indian Institute of Technology Kanpur
, Kanpur, U.P. 208016, India
Search for other works by this author on:
P. S. Ghoshdastidar
Mem. ASME
Department of Mechanical Engineering,
Indian Institute of Technology Kanpur
, Kanpur, U.P. 208016, Indiae-mail: psg@iitk.ac.in
Indrajit Chakraborty
Department of Mechanical Engineering,
Indian Institute of Technology Kanpur
, Kanpur, U.P. 208016, Indiae-mail: indrac@iitk.ac.in
J. Heat Transfer. Dec 2007, 129(12): 1737-1741 (5 pages)
Published Online: March 27, 2007
Article history
Received:
February 5, 2006
Revised:
March 27, 2007
Citation
Ghoshdastidar, P. S., and Chakraborty, I. (March 27, 2007). "A Coupled Map Lattice Model of Flow Boiling in a Horizontal Tube." ASME. J. Heat Transfer. December 2007; 129(12): 1737–1741. https://doi.org/10.1115/1.2768102
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