The effects of bubble induced turbulence and nucleation site density on the hydrodynamics. Modeling of subcooled boiling by extending the rpi wall. This model studies the growth and liftoff of bubbles. The effects of bubble induced turbulence and nucleation site density on the hydrodynamics of the gasliquid boiling flows. Openfoam is an opensource cfd software which is freely available and can be downloaded from the internet. Subcooled boiling flow occurs in many industrial applications such as boilers, nuclear reactors and cryogenic fluid systems. I have to model subcooled nucleate boiling in openfoam as well. Numerical simulation of subcooled nucleate boiling in cooling. Objectives develop analysis methodology to determine the thrust obtained from a water tank heated by a radiative heat flux solar concentrator or.
Here, liquid film flows down a uniform temperature vertical subcooled surface, and condenses. Twophase eulerian model for nucleate subcooled boiling. In this regime, isolated bubbles grow and detach at the heating wall without. Cfd, openfoam, subcooled nucleate boiling flow, wall tempera ture, bubble diameter model, heat flux partitioning, cooling. Cfd simulation of subcooled flow boiling using openfoam. The solver employs object oriented openfoam library features, including. One way to use boiling, in particular subcooled nucleate boiling section 2.
Subcooled flow boiling occurs in most of these reactors which requires large heat. This article describes the implementation and validation of a nucleate boiling model in the volumeoffluid solver of openfoam. Numerical simulations of subcooled nucleate boiling for a. Implementation and validation of twophase boiling flow models in. Subcooled boiling may occur in pressurized water reactors pwrs at high pressure conditions which may trigger the occurrence of departure from nucleate boiling dnb due to the high flux in rod bundles. Emphasis is put on the implementation of the contact line evaporation, which can typically not be resolved by the numerical grid, and on the conjugate heat transfer between solid and fluid. The flow is very complicate since it experiences the nucleation, growth, departure and inhomogeneous dispersion of vapor bubbles at the vicinity of wall as a result of heat and mass transfer and momentum exchange between the two phases. It is well known that at dnb the heat transfer deteriorates dramatically, leading to failure of the fuel. However, vof simulation of phasechange heat transfer is still in its infancy. Pdf cfd modeling of subcooled flow boiling for nuclear.
Objectives develop analysis methodology to determine the thrust obtained from a water tank heated by a radiative heat flux solar concentrator or laser, with a small opening for vapor to escape. Henryk anglart kristian angele division of nuclear reactor technology royal institute of technology stockholm, sweden, february 2011 tritafys 2011. The modeling has been carried out within the openfoam framework and a twophase eulerian approach has been chosen. Downloaded from sae international by ansys inc, monday, september 14, 2015. For the numerical simulation of subcooled pool boiling and wall boiling, the extended rpi boiling model is exploited in the framework of the twofluid cfd approach. Modeling of subcooled nucleate boiling with openfoam edouard michta supervisors. Within the course of this master thesis project, subcooled nucleate boiling in a vertical pipe has been modeled using cfd. The open source cfd code openfoam was developed further to include ke. The main idea is that the wall heat flux can be partitioned in 3 components. Modeling of subcooled nucleate boiling with openfoam. Numerical simulations of subcooled nucleate boiling for a power.
Request pdf cfd simulation of boiling heat transfer using openfoam an eulerianeulerian twophase flow model has been developed to simulate the boiling heat transfer phenomenon in a pipe flow. Abstract within the course of this master thesis project, subcooled nucleate boiling in a vertical pipe has been modeled. Cfd simulation of departure from nucleate boiling in. Modeling of subcooled nucleate boiling with openfoam diva portal. The code can be used to predict the distribution of the local ow parameters, i. In addition to this, advanced subcooled boiling models such as new wall boiling and twophase logarithmic wall function models were also applied for an improvement of energy partitioning and two. Openfoam, subcooled flow boiling, computational fluid dynamics. Twophase eulerian model for nucleate subcooled boiling user name. Numerical simulations of gasliquid boiling flows using openfoam. Article january 20 with 73 reads how we measure reads a read is counted each time someone views a publication summary such as the. For the subcooled nucleate boiling regime the following runtime.