| Project/Area Number |
11650202
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | AKTA UNIVERSITY |
|---|
Principal Investigator |
SUGAWARA Masahiro Akita University, Faculty of Engineering and Resource Science, Professor, 工学資源学部, 教授 (10042011)
|
|---|
| Project Period (FY) |
1999 – 2000
|
| Project Status |
Completed (Fiscal Year 2000)
|
| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
|
|---|
| Keywords | Ice / Melting / Aqueous Solution / Concentration Diffusion / Double Diffusive Convection / 氷板の融解 / 塩化カルシウム水溶液 / 温度と濃度 / 氷の融解 |
|---|
| Research Abstract |
Experimental and numerical investigations are carried out of the melting of a horizontal vertical ice plate into a calcium chloride aqueous solution inside a square cavity. The ice plate immersed into the aqueous solution melts spontaneously associated with temperature depression in the ice even when there is no temperature difference between the ice and the aqueous solution just beginning of the melting, which is not possible to predict through the classical Stefan problem controlled with a thermal diffusion. A numerical method with a new concept of a mass diffusion controlled melting predicts quantitatively an abrupt depression in the temperature of the ice, a transient melting mass, and a double diffusive convection in the liquid. The melting amount from above melting surface is about double larger than that from below due to the concentration induced predominant convection. The numerical results for the melting from below predicts well the experiment, however, predicts less about 40% compared with the experiment. The present numerical treatment based on the laminar assumption is difficult to predict the melting amount from above melting surface since it appeared a very small spouts induced with the buoyancy like a salt finger on the melting surface. Moreover, it is also found that the present numerical prediction will require to set a very smaller mesh size less than about 0.1mm due to the very thin concentration boundary layer closest to the melting front.
|
