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Case Studies in Transient Heat Transfer With Sensitivities to Governing Variables
M. Kemal Atesmen
M. Kemal Atesmen
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Nucleate pool boiling heat transfer rates are very high and therefore it is used to cool devices such as computers, nuclear reactors, rocket motors, etc. During nucleate pool boiling in a large superheated fluid, the bubble growth from a heated surface goes through several stages. First bubble growing stage is mainly governed by surface tension and by inertia forces from the surrounding fluid. In low (Tsup - Tsat), i.e. (Tsup - Tsat) < 5 K, at atmospheric pressure, first bubble growth stage is less than 1 millisecond (ms). The bubble detaches from the heated surface when the buoyant force overcomes the surface tension and the bubble starts to grow close to a spherical shape. The second bubble growth stage is mainly governed by conduction and convection transient heat transfer. In low (Tsup - Tsat), the second bubble growing stage goes up to about 15 ms. Then, the growing bubble enters a third stage, where the fluid’s growing thermal and velocity boundary layers around the bubble interact and govern the bubble growth. There have been many experimental and theoretical studies regarding bubble growth during nucleate pool boiling. An excellent overview of these studies is provided in Ref. [13]. In this chapter, we will model the second growing stage of the bubble surface in an infinite superheated fluid as a semi-infinite solid surface where only transient and one-dimensional heat conduction occurs as shown in Figure 1-1. This analysis assumes water as fluid interfacing a bubble at atmospheric pressure at low superheats, (Tsup - Tsat) < 5 K.

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