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By D. A. Reay (Eds.)

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Additional resources for Advances in Heat Pipe Technology. Proceedings of the IVth International Heat Pipe Conference, 7–10 September 1981, London, UK

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I t X h l· Φ Ix 1· ÜJ cr * *" J « · ? "· * -_J J 10 PROBE INSERTED FROM LEFT SIDE PROBE INSERTED FROM RIGHT SIDE 1 . J - ,.. 20 AXIAL · COORDINATE I 1 30 z , cm Fig. 6. Temperature distribution of the sodium furnace at 894°C (115 kPa). 1 40 I 43 d e c r e a s e d to 880 C. S i m i l a r c u r v e s w e r e m e a s u r e d , but t h e effect w a s now l e s s p r o n o u n c e d , a s shown in F i g . 7. F i n a l l y t h e t e m p e r a t u r e w a s l o w e r e d to 8 0 0 ° C and t h e a n o m a l o u s t e m p e r a t u r e d r o p w a s not m e a s u r a b l e a n y m o r e , a s i n d i c a t e d in F i g .

Heating zone temp. Tv(e) H P . vapor t e m p . ( h e a t i n g z o n e ) Tuple H P . adiabatic zone temp. Tvlc) H P . = (Tv(ei — Τ Η Γ ) ) / Σ q, Tnp(c H P . cooling zone temp. rn Pu ; Cooling zone(condenser zone) Tf Fin root t e m p . Ta,r Air temp. = ( T h , - T H P( , , . ,; Heating zone (evaporator zone) resist. c»)/Zqi rr-b ; Fin-pipe bond ; Convection resist. = (TH P(CI — Τ ί ) / Σ q, resist. = (Tr — Τ , ί Γ) / Σ q, P i g . * Cu-Water(Screen wick) 0= Top heat mode 0"' Bottom heat mode " > 0 ° Top heat mode «<0° Bottom heat mode "10 0 20 30 40 50 60 ~7Ô~ Temp difference ATc P i g · 9 Evaporator performance of heat pipe III -H-fi T ' P i g · 1 0 Condenser performance of heat pipe Ε ( Natural convection ) 18 T.

Cross-section of annular heat pipe. ANNULAR HEAT PIPE PERFORMANCE In the present analysis it is assumed that there are N numbers of connecting wicks and they are equally distributed. Taking advantage of the symmetry the wick is cut at the plane of symmetry and unfolded into a plane for the purpose of the present analysis, as shown in Fig. 4. The wick can be decomposed into three parts : condenser wick (wick 1 ) , connecting wick (wick 2) and evaporator wick (wick 3). A uniform heat load is assumed to be applied to the evaporator section (furnace liner outer shell).

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