A porous media-based transport model for hydrothermal growth

Chen, Qi-Sheng; Prasad, V.; Chatterjee, Avik P.; Larkin, John J.

doi:10.1016/s0022-0248(98)01191-9

Cited by 27 publications

(27 citation statements)

References 3 publications

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“…Two-dimensional calculations are for case studies, and for three-dimensional calculations one can refer to Ref. [10].…”

Section: Resultsmentioning

confidence: 99%

“…After the ammonothermal system is pressurized, ammonia occupies most of the volume. Hence the upper portion can be considered as a fluid layer with the assumption of incompressible flow and the Boussinesq approximation [10,11]. The GaN particles in the bottom of the autoclave can be considered as a porous medium.…”

Section: Article In Pressmentioning

confidence: 99%

“…The GaN particles in the bottom of the autoclave can be considered as a porous medium. In this case, the Darcy-Brinkman-Forchheimer model can be employed in the porous layer, while Navier-Stokes equations can be used in the fluid layer [10,11]. The non-dimensional parameters of the system are listed below:…”

Section: Article In Pressmentioning

confidence: 99%

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Effects of baffle design on fluid flow and heat transfer in ammonothermal growth of nitrides

Chen

Pendurti

Prasad

2004

Journal of Crystal Growth

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Efforts have been made in growing bulk single crystals of GaN from supercritical fluids using the ammonothermal method, which utilizes ammonia as fluid rather than water as in the hydrothermal process. Different mineralizers such as amide or azide and temperatures in the range of 200-600 C have been used to increase the solubility. The pressure is from 1 to 4 kbar. Modeling of the ammonothermal growth process has been used to identify factors which may affect the temperature distribution, fluid flow and nutrient transport. The GaN charge is considered as a porous media bed and the flow in the charge is simulated using the Darcy-Brinkman-Forchheimer model. The resulting governing equations are solved using the finite volume method. The effects of baffle design and opening on flow pattern and temperature distribution in an autoclave are analyzed. Two cases are considered with baffle openings of 15% and 20% in cross-sectional area, respectively. r

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“…Two-dimensional calculations are for case studies, and for three-dimensional calculations one can refer to Ref. [10].…”

Section: Resultsmentioning

confidence: 99%

Section: Article In Pressmentioning

confidence: 99%

See 1 more Smart Citation

Effects of baffle design on fluid flow and heat transfer in ammonothermal growth of nitrides

Chen

Pendurti

Prasad

2004

Journal of Crystal Growth

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“…Since the nutrient concentration variation is usually small, the convection is driven primarily by the temperature difference between the upper and lower chamber walls. Numerical models, including one conjugate model by Roux et al [6] and several isothermal wall models [7][8][9][10], have been developed to investigate the flows in autoclaves. RouxÕs conjugate model, a model of steady laminar flow at low Rayleigh number, predicted a linear temperature distribution at the wall/solution interface from the bottom to the top.…”

Section: Introductionmentioning

confidence: 99%

“…RouxÕs isothermal wall models, a two-dimensional (2-D) and a three-dimensional (3-D) one, are also for flow in the laminar regime, corresponding to autoclaves of very small size. ChenÕs isothermal wall model [7,8] considered unsteady laminar flow in an autoclave of low aspect ratio while focusing on the effects of the raw material region that was modeled as porous media. The 2-D isothermal wall model [9] and the 3-D one [10] by the present authors focused on the flow of solution in current industry size autoclaves with highly turbulent flows.…”

Section: Introductionmentioning

confidence: 99%