2013 Fiscal Year Final Research Report
Development of Unified Physical Model for Flow Boiling inside an Internally, Spirally, Grooved Tube, which is Applicable for Fluids with Much Different Thermophysical Properties
| Project/Area Number |
23560237
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | Nagasaki University |
|---|
Principal Investigator |
MOMOKI Satoru 長崎大学, 工学(系)研究科(研究院), 教授 (60244034)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHIGECHI Toru 長崎大学, 名誉教授 (90100883)
|
|---|
| Project Period (FY) |
2011 – 2013
|
| Keywords | 伝熱機器 / 管内蒸発 / 気液二相流 / 熱伝達 / 流動様式 / 熱物性 / 内面ら旋溝付管 |
|---|
| Research Abstract |
The flow pattern and heat transfer of evaporating ammonia inside a horizontal spirally grooved tube were experimentally investigated. Test fluids used were HCFC123 and ammonia, those physical properties are much different from each other. The characteristics of experimentally obtained flow pattern information and heat transfer coefficients were investigated.
At first the limit of currently available model and method to treat this problem were shown through this discussion. The measured flow pattern transition qualities were compared with some available correlations both for a smooth tube and a grooved tube. The new correlations for the transition quality between separated and annular flow regimes, for the transition quality between annular/separated to mist flow regimes, and for the heat transfer coefficients in annular flow regime were proposed for both HCFC123 and ammonia by one equation. Also physical model to treat fluids with much different physical properties were proposed.
|
