A 2D axisymmetric numerical analysis was performed to study the characteristics of charge process inside solar thermal storage tank. The porosity and heat transfer coefficient of filler material as well as inlet velocity of heat transfer fluid are selected as simulation parameters. The porosity is varied as 0.2, 0.5, and 0.8 to account for the effect of filler granule geometry. Two levels of the heat transfer coefficient is adopted to assess the heat transfer between heat transfer fluid and filler material. The inlet velocity is varied as 0.00278, 0.0278, and 0.278m/s. As both of the porosity and the heat transfer coefficient increase, the discrepancy of the temperature distributions between the filler and heat transfer fluid decreases. As the inlet velocity increases, the penetration depth of the heat transfer fluid increases proportionally.

Abstract
 1. 서론
 2. 연구 방법
  2.1 수치해석 모델
  2.2 계산 조건
 3. 결과 고찰 및 분석
  3.1 Porosity 영향
  3.2 HTC 영향
  3.3 Inlet velocity 영향
 4. 결론
 후기
 References

• 조재혁(공주대학교 대학원 기계공학과) | Jae Hyuk Jo
• 김우태(공주대학교 기계자동차공학부) | Woo Tae Kim Corresponding Author