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NUMERICAL SIMULATION OF BUBBLE NUCLEATION AND GROWTH USING LATTICE BOLTZMANN METHOD

Saritha Gaddam
Department of Mechanical & Aerospace Engineering Indian Institute of Technology Hyderabad Kandi, Sangareddy, Telangana, India, 502285

Raja Banerjee
Department of Mechanical and Aerospace Engineering, Indian Institute of Technology Hyderabad, Yeddumailaram, Telangana 502205, India

DOI: 10.1615/IHMTC-2017.2460
pages 1771-1778

摘要

Boiling is the complicated process in which phase change occurs involving nucleation of bubble, growth of bubble, transport of latent heat and unstable interface. Nucleate boiling is one of the effective ways to heat transfer in micro-electronic devices, cooling of computer chips, compact heat exchangers and in components of nuclear and chemical reactors. A high density Pseudopotential Lattice Boltzmann method coupled with Peng-Robinson Equation of state (PREOS) and Exact Difference (EDM) force scheme used to simulate the nucleate boiling under constant wall temperature for water. The code is being validated with the correlation for the prediction of departure diameter (D) from a horizontal heated surface. is proportional to gravity (g) as proposed in the literature (D ∝ g-0.52).The bubble release period varies under the action of gravity as f-1∝g-0.529. Effect of micro-heater size and superheat of micro-heater, on the bubble departure process is studied at a saturation temperature of 583K. Heat transfer is higher with the increased heater size and increased superheat temperature of micro heater. An attempt is made for the bubble merger with different wall superheats and flow boiling in a slow moving fluid with low inlet uniform velocities. The period of coalescence of the bubble merger is estimated and bubble hydrodynamics during flow boiling is observed. The temperature contours near the heated wall is studied for boiling in flowing fluid.

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