Research Papers: Evaporation, Boiling, and Condensation

Simplified Model for Prediction of Bubble Growth at Nucleation Site in Microchannels

[+] Author and Article Information
Sambhaji T. Kadam, Kuldeep Baghel

Mechanical Engineering Department,
Indian Institute of Technology Indore,
Madhya Pradesh 453446, India

Ritunesh Kumar

Mechanical Engineering Department,
Indian Institute of Technology Indore,
Madhya Pradesh 453446, India
e-mail: ritunesh@iiti.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 20, 2013; final manuscript received January 24, 2014; published online March 11, 2014. Assoc. Editor: Giulio Lorenzini.

J. Heat Transfer 136(6), 061502 (Mar 11, 2014) (8 pages) Paper No: HT-13-1316; doi: 10.1115/1.4026609 History: Received June 20, 2013; Revised January 24, 2014

Formation of the first bubble at nucleation site is an inception of the two phase flow in pool boiling and flow boiling. Bubble dynamics (bubble nucleation, growth, and departure) plays an important role in heat transfer and pressure drop characteristics during two phase flow in microchannels. In this paper, a simplified model has been developed for predicting bubble growth rate at nucleation cavity in microchannel. It is assumed that heat supplied at nucleation site is divided between the liquid phase and the vapor phase as per instantaneous void fraction value. The energy consumed by the vapor phase is utilized in bubble growth and overcoming resistive effects; surface tension, inertia, shear, gravity, and change in momentum due to evaporation. Proposed model shows a good agreement with available experimental works. In addition, the bubble waiting time phenomenon for flow boiling is also addressed using proposed model. Waiting time predicted by the model is also close to that obtained from experimental data.

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Fig. 1

Energy distribution at nucleation cavity

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Fig. 2

Diagram of truncated bubble and centroid of the bubble

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Fig. 3

Comparison of present model with Liui et al. [21]

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Fig. 4

Variation of energy utilization in various effects during bubble growth

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Fig. 5

(a), (b) Comparison of present model with Lee et al. [43]

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Fig. 6

Comparison of present model with Li et al. [52]

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Fig. 7

Comparison of present model with Meder [53]

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Fig. 8

Stages of bubble nucleation process




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