Khảo sát đặc tính vi lỏng của chất lỏng có độ nhớt cao trong ống vi mao quản bằng phương pháp sử dụng áp suất hỗ trợ
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Abstract
The microfluidic behavior of highly viscous in micro-capillary was investigated by the infiltration technique. Computational Fluid Dynamics (CFD) simulations were conducted to predict the flow behavior, filling time, and filling length. The results showed good agreement with experiments. The experimental results indicated that fluid viscosities were not found to depend on capillary dimensions, so the microscale viscosity can be regarded as equal to the bulk viscosity. This equivalence means that this technique can be employed to determine the melt viscosity of certain glasses. However, when using this method, the effects of the capillary radius and interfacial reactions between the filling glass melts and capillaries should be carefully investigated; otherwise, they can influence the precision of the measurement.
Tóm tắt
Đặc tính vi lỏng của chất lỏng có độ nhớt cao trong ống vi mao quản được khảo sát bằng kỹ thuật sử dụng áp suất hỗ trợ. Các mô phỏng CFD được thực hiện để dự đoán đặc tính dòng chảy, thời gian và chiều dài dâng lên trong ống vi mao quản. Kết quả mô phỏng cho thấy sự tương đồng với thực nghiệm. Kết quả thực nghiệm chỉ ra rằng độ nhớt của chất lỏng trong ống vi mao quản không phụ thuộc đường kính của ống, vì thế độ nhớt đo được từ phương pháp này tương đương với độ nhớt được đo bằng những phương pháp thông dụng. Điều này cho phép kỹ thuật hỗ trợ áp suất có thể được sử dụng để xác định độ nhớt nóng chảy của một số loại thủy tinh nhất định. Tuy nhiên, độ chính xác của phương pháp này phụ thuộc phần lớn vào kích thước ống mao dẫn và những phản ứng bề mặt xảy ra giữa thủy tinh nóng chảy bên trong và ống mao quản.
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