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2OF; N t BUBBLES/IN2). TIlIS FIGURE IS REPRODUCED FRW THE PAPER BY CUmE CORTY AM) u x s. FOUST (13, u). 30 c r i t i c a l heat flux i s l o G Iccd/rn%r. The dependence of t h e nucleate b o i l i n g curve upon t h e surface roughness can be expected t o manifest i t s e l f i n the low flux region because boiling i n patches occurs a t lower heat flux d e n s i t i e s . , patches. the termination of b o i l i n g i n A large nmber of a c t i v e nucleating c e n t e r s would tend t o decrease the e f f e c t s of d i f f e r e n t surface roughness.
Diameter Dd The departure i s governed by t h e dynamics of t h e surrounding l i q u i d as well as by t h e buoyant and adhesion forces. The dynamic e f f e c t of t h e surrounding liquid upon a bubble departing from the surface has n o t been evaluated q u a n t i t a t i v e l y yet. The problem w a s analyzed by Wark (21), F r i t z ( 2 2 ) and by Nesis (121, who considered a s t a t i c equilibrium between t h e buoyant and adhesive forces. For such a s t a t i c condition the problem becomes an analogue to the problem of determining t h e maximum volume of a sessile drop hanging from a horizontal surface, a problem which w a s analyzed by Bashfort and Adams (23).
The phenomenon w i l l be described i n more d e t a i l i n order that, i n Chapter 111, it may be more easily compared t o the process of a gas h b b l i n g through a porous plate. The discussion i n this section i s based t o a large extent upon a penetrating study of nucleate boiling which was reported by Courty (13) and Courty and Foust (14). \ :--- 25 gas o r vapor. starting" superheat temperatures. The heat f l u x s t a r t s deviating f r o m the values corresponding t o n a t u r a l convection when f e w of these a c t i v e bubble c e n t e r s appear.