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Study of two-phase flow and thermal instabilities during convective boiling in micro-scale channels

Grant number: 11/01372-3
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): August 01, 2011
Effective date (End): January 31, 2014
Field of knowledge:Engineering - Mechanical Engineering - Transport Phenomena
Principal Investigator:Gherhardt Ribatski
Grantee:Cristiano Bigonha Tibirica
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


This pos-doctoral research proposal is related to several projects about micro-scale convective boiling currently running in the Heat and Mass Transfer Group from the Department of Mechanical Engineering at Escola de Engenharia de São Carlos - USP. Recent results from microchannel literature have showed a disagreement between experimental data from distinct authors. In the specific case of liquid film flows (slug, churn and annular), the most recent literature shows that this difference can be related to intermittent film characteristics near the surface and entrainement in the gas core. These characteristics are related to the physical mechanisms which explain the heat transfer, pressure drop and critical heat flux. In this context, the present research proposal has the aim of studying the instabilities in michochannles during convective boiling. Firstly, a vast bibliographic review about the types of two-phase flow instabilities will be performed. Experimental data from the present group will be analyzed for quantitative information about instabilities in convective boiling inside microchannels. With these results a classification of observed instabilities will be performed and a effort to identify the main physical mechanisms necessary for the development of new predictive models for instabilities and their respective characteristics, like wave amplitude, length, shape and speed.

Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
KANIZAWA, FABIO TOSHIO; TIBIRICA, CRISTIANO BIGONHA; RIBATSKI, GHERHARDT. Heat transfer during convective boiling inside microchannels. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v. 93, p. 566-583, FEB 2016. Web of Science Citations: 24.
TIBIRICA, CRISTIANO BIGONHA; CZELUSNIAK, LUIZ EDUARDO; RIBATSKI, GHERHARDT. Critical heat flux in a 0.38 mm microchannel and actions for suppression of flow boiling instabilities. EXPERIMENTAL THERMAL AND FLUID SCIENCE, v. 67, n. SI, p. 48-56, OCT 2015. Web of Science Citations: 15.
TIBIRICA, CRISTIANO B.; RIBATSKI, GHERHARDT. Flow Boiling Phenomenological Differences Between Micro- and Macroscale Channels. HEAT TRANSFER ENGINEERING, v. 36, n. 11, SI, p. 937-942, JUL 24 2015. Web of Science Citations: 5.
TIBIRICA, CRISTIANO BIGONHA; RIBATSKI, GHERHARDT. Flow patterns and bubble departure fundamental characteristics during flow boiling in microscale channels. EXPERIMENTAL THERMAL AND FLUID SCIENCE, v. 59, p. 152-165, NOV 2014. Web of Science Citations: 36.
TIBIRICA, CRISTIANO BIGONHA; RIBATSKI, GHERHARDT. Flow boiling in micro-scale channels - Synthesized literature review. INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, v. 36, n. 2, SI, p. 301-324, MAR 2013. Web of Science Citations: 66.

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