MICE Collaboration meeting at Columbia University, New York 12 – 14 June 2003 How Liquid Hydrogen behaves thermally in a Convective Absorber by Wing Lau,
Published byModified over 4 years ago
Presentation on theme: "MICE Collaboration meeting at Columbia University, New York 12 – 14 June 2003 How Liquid Hydrogen behaves thermally in a Convective Absorber by Wing Lau,"— Presentation transcript:
MICE Collaboration meeting at Columbia University, New York 12 – 14 June 2003 How Liquid Hydrogen behaves thermally in a Convective Absorber by Wing Lau, Stephanie Yang -- Oxford University
Cooling performance of the Convective absorber design The MICE absorber adopts a convective cooling design. The heating power of the beam is being cooled by the stagnant pool of liquid hydrogen which contacts directly. The liquid hydrogen is in turn being cooled by the gas helium.
The analysis are being carried out in two phases. In the first phase, we examine the cooling effect of the absorber without any heat exchange from the gas helium. In this model, the initial temperature of the liquid hydrogen was set at 17K and the containment walls of the absorber is kept at 17 K. Adiabatic boundary conditions were applied, i.e. no heat is exchanged between the outside and the inside of the containment wall. This is a reasonable assumption as there is a layer of vacuum outside the absorber that prevents heat transfer by convection; This work is now completed. We looked at how the liquid hydrogen behaves under a beam power of 60W, 150W and 300W respectively. In our second phase of the analysis, we have included the helium gas a medium of heat exchange. The temperature of the containment wall is no longer specified, but determined by flow and heat carrying capacity of the gas helium. This work is still on going.
A reminder of what we did on the force – flow Absorber design
without the inlet and outlet manifoldswith the inlet and outlet manifolds The 3-D models
model mesh -- over 1.5 million grids Beam modelled as a 10mm tube
Absorber diameter: 300mm Beam diameter: 10mm, Power: 150W GHe pipe diameter: 15mm, length of pipe is 15mm, inlet velocity: 2m/s Multicomponent: fluid domain: GHe, LH2, fluid sub-domain: beam, solid sub- domain: wall Turbulent Model: K-Epsilon Initial temperature: GHe:17K, LH2: 17K Global Temperature result see next page beam GHe inlets GHe outlets Meshed model LH2 region Solid dividing wall