| 摘要 |
PROBLEM TO BE SOLVED: To promote vaporization of fuel and further to suppress an increase in a pressure loss.SOLUTION: A heat exchanger 13 for vaporizing fuel includes a first fuel passage 14a and a second fuel passage 15a. A fuel within the first fuel passage 14a is heat-exchanged with a first heat medium within a first heat medium passage 14b. A fuel within the second fuel passage 14b is heat-exchanged with a second heat medium within a second heat medium passage 15b. A temperature T2 of the second heat medium is higher than a temperature T1 of the first heat medium. The fuel flows as an annular flow ANF and then flows as a mist flow MSF. Only in an area of the mist flow, an inner fin 15ff is provided. The inner fin 15ff makes narrow the sectional area of the second fuel passage 15a. The flow rate of the fuel is increased in the second fuel passage 15a. Thus, heat is efficiently transferred to the fuel of the mist flow in accordance with a great temperature difference DTmsf in the second fuel passage 15a and a narrow passage sectional area in the second fuel passage 15a. |
