This paper presents the theoretical analysis for the flow driven by surface tension and gravity force in an inclined circular tube. The previously developing equation for Power-Law model is a simple ordinary differential type. A governing equation is developed for describing the displacement of a non-Newtonian fluid(Casson model) that continuously flows into a circular tube by surface tension, which represents a second-order, nonlinear, non-homogeneous, and ordinary differential form. It was found that the theoretical predictions of the governing equation were in good agreement with the results for considering the Newtonian model.

ABSTRACT
 1. 서 론
 2. 이 론
  2.1 Casson 모델
  2.2 체적유량
  2.3 속도분포
  2.4 벽전단율
  2.5 지배방정식
 3. 결과 및 고찰
  3.1 지배방정식의 유용성 검토
  3.2 항복응력의 변화에 따른 변위
  3.3 항복응력의 변화에 따른 벽전단율
 4. 결 론
 References

• 모정하(Division of Mechanical & Automotive Engineering at Wonkwang university.) | Jeong-Hah Moh Corresponding Author