By early 1945, Nishina's team was still struggling to make U-235 from uranium hexafluoride gas in a leaky chamber using a technique known as gaseous thermal diffusion, the Tokyo Institute of Technology's Yamazaki said.
42.
A typical parameter which governs the signal in this case is the " thermal diffusion length ", which depends on the material and the modulation frequency and ordinarily is in the order of several micrometers.
43.
They calculated that a liquid thermal diffusion plant capable of producing 1 kg per day of uranium enriched to 90 % uranium-235 would require 21, 800 columns, each with a separation factor of 30.7 %.
44.
Murphree suggested that a liquid thermal diffusion plant producing uranium enriched to 10 % uranium-235 might be a substitute for the lower stages of a gaseous diffusion plant, but the S-1 Executive Committee decided against this.
45.
For this we have defined a function H ( x, y ) known as heatfunction such that the net flow of energy ( thermal diffusion + enthalpy flow ) across each H = constant line is zero.
46.
That is, a low Pr material, with its thermal diffusion rate closer to its momentum diffusion rate, can achieve a fully developed heat flow at a shorter distance compared to a high Pr material in this situation.
47.
The committee also suggested suitable industrial organisations and . . . " furnished us with a blueprint for the complete industrial organization of the project which S-50 thermal diffusion plant developed by Philip Abelson of the US Navy.
48.
The liquid thermal diffusion process was not one of the enrichment technologies initially selected for use in the Manhattan Project, and was developed independently by Philip H . Abelson and other scientists at the United States Naval Research Laboratory.
49.
The diary of Masa Takeuchi, a worker assigned to Nishina's thermal diffusion separation project, says Nishina wanted to process hundreds of tons of uranium at the rate of 300 mg per day, according to the U . S . journal Science.
50.
Compared to earlier work, this approach improved spatial resolution because the use of short laser pulses reduced the duration of the thermal expansion pulse to the point that the thermal diffusion lengths can be on the scale of nanometres rather than microns.
