LHCb-VELO evaporator CoBra Calculation and feed through ideas. 18 February 2015 Bart Verlaat 1

Micro channel numbers 2

Cobra simulation of according previous slide 3

CoBra simulation with reduced flow 4

Flow more reduced…… 5

A reduced flow until X=0.9 => Dryout 6 Interesting the model does not show dry-out Also very interesting: The pressure drop does not depend on flow!! I’ve never seen that…. Model must be crazy for microchannels, Test, test, test!!!

Reduced power. 7

Evaporator with connections outside vacuum 8 Connectors outside vacuum Vacuum connector Rolled up during handling Insulation Vacuum

Cooling feed through 9 2x 1/8” VCR Gland (D=1/4”) 1/8” VCR glands without nuts are very small and fit both through a 14mm hole (10mm would even work) A split nut ala IBL can be installed after insertion Hole diameter 14mm Braze connection (Cold) O ring connection (Warn)

1/8” VCR with splitnut 10 D=1/4” (6.35mm) 1/8” VCR with split nut Atlas-IBL cooling line

Cooling feed through and manifold vacuum box 11 Outlet manifold Velo secondary vacuum Inlet manifold Cooling insulation vacuum Flexible connections VCR Split nut Connection details outside vacuum (inside a tertiary vacuum box).