Title :
Estimation of dispenser cathode surface temperature of a practical potted heater cathode assembly
Author :
Sil, A. ; Samria, N.K. ; Chatterjee, A. ; Venkateswarlu, D.S.
Author_Institution :
Banaras Hindu Univ., Varanasi, India
fDate :
10/1/1993 12:00:00 AM
Abstract :
The heat transfer through the porous and/or infiltrated potted heater-cathode structure is simulated by a numerical model. The model includes heat conduction through a porous potting having isometric pore shape and uniform size (310 μm in alumina potting and 20 μm in tungsten cathode pellet), imperfect interface heat transfer effect and radiative boundaries. In addition to the transient study, a steady-state analysis, using the numerical model has also been done for a commercial Spectra-Mat cathode. The predicted results have been compared with the experimental measurements and are found to be in good agreement
Keywords :
heat transfer; microwave tubes; modelling; porous materials; thermal analysis; thermal conductivity of solids; thermionic cathodes; transient response; 20 micron; 310 micron; Al2O3; BaO; BaO-W; W cathode pellet; alumina potting; commercial Spectra-Mat cathode; dispenser cathode surface temperature; heat conduction; imperfect interface heat transfer effect; infiltrated potted; isometric pore shape; microwave tube cathode; numerical model; porous potting; potted heater cathode assembly; radiative boundaries; steady-state analysis; transient study; uniform pore size; Assembly; Cathodes; Compaction; Electron tubes; Electronic packaging thermal management; Heat transfer; Surface resistance; Temperature dependence; Thermal factors; Thermal resistance;
Journal_Title :
Electron Devices, IEEE Transactions on
