[en] In this report a graphical method to analyze the direct suspension-cyclon heat exchangers, in multi-stage configuration is presented. Each tube-cyclon stage is regarded as an equilibrium unit. The modification of the graphical method is considered in the case of solid entrained by the current of gas leaving the cyclon, and of gas by-passed in solid feed. The graphical method of analysis is useful to evaluate the operating conditions of the heat exchanger. (Author) 6 ref

[en] Report on the Seminar celebrated in Madrid between KfK (Karlsruhe) and JEN (Madrid) concerning a Joint Irradiation Program of Fast Reactor Fuel Rods. The design of fuel rods in general is defined, and, in particular of those with a density 94% DT and diameter 7.6 mm up to a burn-up of 7% FIMA, to be irradiated in the FR2 Reactor (Karlsruhe). Together with the design of NaK and single-wall capsules used in this irradiation, other possibilities of irradiation in the reactor will also be described. (auth.)

[en] The experimental work carried out in pilot plant scale for uranium extraction from clarified ore leach liquors, has allowed to obtain fluidized bed break through curves relationship, including the main variables involved in the equilibrium and kinetic of the process. Two calculations methods have been developed in order to predict the behaviour or the ion exchange column, working in periodic from and with countercurrent flows. These methods, called the efficiencies method and the constant feeds method, have been tried by batch-wise and continuous tests, reaching results very close to experimental values. (author)

[en] The heat transfer between one liquid phase dispersed in drops in other insoluble liquid phase is studied. In order to analyze the direct contact heat transfer for different systems has been used. The relative importance of properties affecting the fluid-dynamics and the energy exchange between phases has been checked. (author)

[en] The contribution of the elemental stages of formation, movement and coalescence of drops, in direct contact heat exchange are studied. The heat transfer efficiencies are evaluated through correlations corresponding to several models, together with a new experimental technique and model of data analysis. This technique being a alternative design allows the obtention of high heat transfer efficiencies (more than 95%). (author)

[en] A continuous ion exchange pilot plant, with a column operated like a series of fluidized beds of resin, is reviewed. Experimental work was carried out on a uranium extraction from ore leach liquors. Equilibrium and kinetics studies have allowed to obtain the fluidized bed breakthrough curves relationship. Two methods have been developed in order to predict the column efficiency, when it is working in periodic form and with countercurrent flows. These methods have been tried by batch-wise and continuous tests, reaching results very close to experimental values. (author)

[en] The rate of mass transfer between water and naftenic acid and threebutilphosphate in kerosen are studied in the two possibilities to or from water. The two insoluble phases are brought in to intimate contact with dispersed phase droplets, in a single-stage process. The evolution of the equilibrium distribution of solute is taken in consideration. (author)

[en] The annular liquid-gas flow in vertical ducts is studied in order to know the possibilities of these devices as direct heat exchangers. The liquid-gas flow rate in liquid lifting and the friction losses are correlated with the Froude number of the mixture. (author) 17 refs

[en] The mass-transfer between phases is studied in case of dispersed-phase droplets. These droplets are or are not re-formed two or three times. The experimental determination of the rate of mass transfer is studied in order to know rate control. (author)