2015 Fiscal Year Final Research Report
A Proposal of Microlayer Heat Transfer Model for Microbubble Emission Boiling
| Project/Area Number |
26630070
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | Kyushu Institute of Technology |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2014-04-01 – 2016-03-31
|
| Keywords | 沸騰熱伝達 / 気泡微細化沸騰 / ミクロ液膜モデル / サブクール沸騰 |
|---|
| Outline of Final Research Achievements |
Focusing on the microlayer, we studied the heat transfer mechanism of the MEB in the subcooled boiling theoretically and experimentally. First, we present the theoretical estimations of bubble-formation and growing periods on the heating surface under the large subcooling and high-superheat conditions. The estimations give us the boiling curves. In the experiments using platinum wire, we have obtained the heat transfer characteristics including the CHF. However, MEB is not observed on the boiling curve. For the large subcooling, fine bubbles are observed in high heat flux region, which is considered to be dissolved gases and have no significant effect on the boiling heat transfer. The comparisons between the experimental results and the microlayer model show good agreement and indicate that the period of the primary bubbles generated on the heat transfer surface is most important in the subcooled boiling heat transfer.
|
| Free Research Field |
熱工学
|
