Boiling heat transfer and two-phase flow by L S Tong

By L S Tong

This can be a first-class e-book to have for an engineer who take care of two-phase flows and warmth move, in the event you layout and function nuclear reactors, thermal strength vegetation and different thermal administration platforms. It offers a beginning, with an in depth choice of empirical formulae that may be beneficial if adequately utilized. What feels lacking during this booklet, - and is common function of BOOKS on two-phase flows and boiling - is the heavy empiricism, the inability of a systematic suggestion, the absence of strong theoretical remedy that one should still own after analyzing the sort of accomplished compilation. that's to claim, it's stable for a few person who is familiar with the subject/field, no longer for educating an individual approximately boiling warmth move and two-phase flows.

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Sample text

One solution that was considered by Rayleigh (Lamb, 1 945) for the determina­ tion of bubble collapse time, tm, used the model of a bubble with initial size Rm, sudde nly subjected to a constant excess liquid pressure Pc Neglecting the surface tension and the gas pressure in the bubble, Eq. (2-29) may be rearranged to (2 -30) with initial conditions R(O) R(O) = = Rm w 0 By integration, (2 -3 1 ) Introducing the dimensionless radius, R+ = RIRm, and rearranging, Eq. (2-3 1 ) leads t o the integral form (2 -32) from which the collapse time tm is evaluated as (2-33) For the time and size relationship for bubble growth to the maximum size, Rm, Bankoff and Mikesell ( 1 959) arrived at essentially the same results.

Pool boiling is boiling on a heating surface submerged in a pool of initially quiescent liquid. Flow boiling is boiling in a flowing stream of fluid, where the heating surface may be the channel wall confining the flow. A boiling flow is composed of a mixture of liquid and vapor and is the type of two-phase flow that will be discussed in this book. Because of the very high heat transfer rate in boiling, it has been used to cool devices requiring high heat transfer rates, such as rocket motors and nuclear reactors.

Equations (2-23) and (2-24) were solved by an iterative procedure until the temperature distribution used in the solid at the beginning of the bubble growth period was the same as that calculated for the end of the waiting period (Dwyer, 1 976). As will be discussed in the next section, there is evidence that, in general, the length of the bubble growth period for liquid metals is shorter than that for ordinary liquids and probably seldom exceeds a few tens of millisec­ onds. Experimental results show that the total ebullition cycle time, a b , for liquid metals is typically of the order of 1 sec.

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