Homogeneous Reactor

homogeneous reactor

[‚hä·mə′jē·nē·əs rē′ak·tər]
A nuclear reactor in which fissionable material and moderator (if used) are intimately mixed to form an effectively homogeneous medium for neutrons.

Homogeneous Reactor


a nuclear reactor in which the active core consists of a homogeneous mixture of nuclear fuel and a moderator.

The distinguishing feature of the homogeneous reactor is the absence of fuel elements; the nuclear fuel and the raw material for breeding (uranium, thorium, or plutonium) may be placed into the active core as a salt solution with ordinary or heavy water, or as a dispersion in a solid moderator (for example, graphite). Possible modifications of the homogeneous reactor contain the fuel in gaseous form, such as gaseous compounds of uranium or a suspension of uranium dust in a gas. The heat released in the core may be conducted away by a heat transfer agent (water, gas, or other materials), which is circulated through pipelines that pass through the core, or else the homogeneous mixture of fuel and moderator is conducted out of the core directly.

Because of considerable difficulties of engineering and design, homogeneous reactors are not widely used and are applied only for experimental purposes. There are only isolated examples of projects using homogeneous reactors as heat sources in the industrial production of electrical power.


References in periodicals archive ?
To conveniently apply this model to engine simulations without introducing significant computational overheads, the table based on homogeneous reactor is processed to include the effects of turbulence chemistry interation as shown in Fig.
Initial temperature conditions for homogeneous reactor calculations include fuel evaporation effects, according to Eq.
Diffusion of progress variable affects the temperature distribution in the rich region, and also the homogeneous reactor assumption produces a slight difference in the acetylene distribution (see Fig.
To overcome the limitation of the TWM model which is represented by the neglection of turbulence-chemistry interaction, the TPPDF model computes the average progress variable reaction rate by integrating the corresponding homogeneous reactor values with a probability density function in each CFD cell.
The use of the homogeneous reactor assumption to estimate reaction rates in the representative interactive flamelet model is illustrated in Figs.
Afterwards, the attention was mainly focused on the capability to reproduce both auto-ignition and diffusive flame structure and for this reason tabulations based on auto-igniting homogeneous reactors [17, 18] or diffusive flamelets [19, 20, 21] were presented and successfully applied to model Diesel combustion.
2D Homogeneous Reactor. The reactor considered is composed only of one material, whose cross sections are shown in Table 1.
3D Homogeneous Reactor. The reactor considered is composed of the same material as the 2D homogeneous reactor, it is a parallelepiped of the next dimensions: 100 cm x 60 cm x 180 cm.
In fact, the homogeneous reactors check the discretization of the equations without taking into account the use of the global diffusion coefficient and the heterogeneous reactors check the different approaches of the global diffusion coefficient developed in this study.
A single particle, however, is considered a closed system from the material point of view; therefore it can be modeled as a microbatch homogeneous reactor for bulk polymerization.
Topics include: stoichiometry and kinetics, homogeneous reactors, non-ideal reactors, catalytic two- and three-phase reactors, gas-liquid reactors, new reactor and reaction engineering, and more.