Advances in Heat Pipe Technology. Proceedings of the IVth by D. A. Reay (Eds.)

By D. A. Reay (Eds.)

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

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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 . 8. " " Γ " ' ! _J * »] o " I x PROBE INSERTED FROM LEFT SIDE 1* FROM RIGHT SIDE 1 PROBE INSERTED I 1 10 .

If the pressure drop in the vapor phase is neglected, the maximum pressure difference across the whole wick should be within the maximum capillary pressure attainable that is 2σ/ r where σ is the surface tension of the fluid and r is the effective capillary radius of the wick. When q is uniform in wick 1 (uniform heat removal) and the total pressure drop is equal to 2a/r, the corresponding total heat flux Qmax of the entire heat pipe is defined as the transport capability of the pipe. When q is uniform, the liquid flows only in the y direction so that Eq.

The temperature variation in the liquid for the constant heat flux case is much larger than that for the constant temperature case. In fact in the former case it is not necessary to input the amount of heat specified (about 1200 W ) . The temperature distributions for less heat input values for the constant heat flux case are presented in Fig. 7. As the temperature variation in the liquid phase decreases, the temperature gradient at the interface decreases. For 800 W total heat input the gradient is 49 °C/cm and for 600 W it is 32 °C/cm.

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