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| Author(s): |
Francismara Pires Cabral
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2012-05-29 |
| Examining board members: |
Gherhardt Ribatski;
Enio Pedone Bandarra Filho;
Oscar Mauricio Hernandez Rodriguez
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| Advisor: | Gherhardt Ribatski |
| Abstract | |
The present work aims the theoretical study of convective boiling of nanofluids in small diameter channels (called microchannel). It discusses an analysis of the literature on convective boiling of conventional fluids in microchannels which presents criteria for the transition between conventional and microchannels and the flow patterns observed in small diameter channels. Methods for predicting the transport properties of nanofluids were compiled from the literature and experimental studies of forced convection, nucleate boiling and convective boiling of nanofluids were discussed. A method for predicting the heat transfer coefficient of nanofluids in microchannels during convective boiling was proposed based on conventional models from literature adjusted to nanofluids. The conventional models fitting was performed by regression analysis of experimental data for nucleate boiling and forced convection of nanofluids compiled from the literature and by critical analysis of dimensionless numbers which enable to capture the influence of nanoparticles on heat transfer process. In general the proposed method in this work presents reasonable agreement with independent experimental data regarding the increase in heat transfer coefficient with increasing nanoparticles volume fraction. However the scarcity of experimental studies on the convective boiling of nanofluids, especially in microchannels, precluded further analysis of the proposed method. (AU) | |
| FAPESP's process: | 09/13323-7 - Experimental Investigation of Flow Boiling of Nanofluids in Micro-Scale Channels. |
| Grantee: | Francismara Pires Cabral |
| Support Opportunities: | Scholarships in Brazil - Master |