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

By D. A. Reay (Eds.)

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

Example text

In this fin shape, it is found that the maximum of *hf is exist in the neighborhood of 7 mm pitch. And another fin shape can be available for desired specifications. The fin bond resistance rf ^ c a n ^ e negligible. Fig. 12 shows radiator performance of S type for effective output 75 W x 2 (8Ω) power amplifier as an example. ACTUAL MOUNTING OF HEATKICKER ON COMMERCIAL AUDIO AMPLIFIER AND ITS EFFECTS Figs. 1 3 ^ 1 6 HEATKICKER. sink, as fin radiator fin make comparison of the conventional aluminum extruded heat sink with In the case that total transistor power 60W is impressed in each heat area being equal, it is found that both junction temperature and temperature become low by heat pipe system.

T h i s effect can be e x plained with a d e c r e a s e of the e l e c t r i c a l r e s i s t i v i t y of s o m e a l u m i n a i n s u l a t o r s b e c a u s e of the high t e m p e r a t u r e and the p r e s e n c e of r e s i d u a l i m p u r i t i e s . A s a c o n s e q u e n c e , p a r t of the m e a s u r i n g c u r r e n t i s p r o g r e s s i v e l y p a s s i n g t h r o u g h the i n s u l a t o r s a s the p r o b e e n t e r s f u r t h e r into t h e c h a m b e r and a n a p p a r e n t t e m p e r a t u r e d r o p is m e a s u r e d .

01 °C ( B a s s a n i and L o e n s , 1978). T h e s e i n i t i a l r e s u l t s s t i m u l a t e d the e x t e n s i o n of t h i s w o r k to h i g h e r t e m p e r a t u r e s . F o r t h i s p u r p o s e a g a s c o n t r o l l e d s o d i u m h e a t pipe f u r n a c e w a s built, u s i n g the 37 38 c e n t r a l c h a n n e l of a n a n n u l a r h e a t - p i p e a s t h e f u r n a c e c h a m b e r . I n i t i a l m e a s u r e m e n t s w e r e r e p o r t e d of the t e m p e r a t u r e d i s t r i b u t i o n along t h e e m p t y c h a m b e r of the f u r n a c e o p e r a t i n g a t 850°C a n d i n s i d e a b l a c k body c o n f i g u r a t i o n , a t 890°C ( B a s s a n i , B u s s e a n d G e i g e r , 1980).

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