Question:
Which of the following types of agitators is suitable for a product with high viscosity?
Which of the following types of agitators is suitable for a product with high viscosity?
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Agitator Selection by Viscosity:
High Viscosity Products (SCM, Processed Cheese, Khoa) $\rightarrow$ ANCHOR TYPE HELICAL RIBBON.
Low Viscosity (Fluid Milk) $\rightarrow$ Propeller type.
High Viscosity Products (SCM, Processed Cheese, Khoa) $\rightarrow$ ANCHOR TYPE HELICAL RIBBON.
Low Viscosity (Fluid Milk) $\rightarrow$ Propeller type.
Updated On: Sep 15, 2026
- Anchor type
- Propeller type
- Paddles type
- Fan type
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Agitator impeller selection by fluid viscosity: Marine propellers are suited for low-viscosity fluids ($< 2 ext{ Pa}\cdot ext{s}$), paddle agitators for moderate viscosity ($< 50 ext{ Pa}\cdot ext{s}$), and close-clearance Anchor-type Helical ribbon agitators for high-viscosity non-Newtonian pastes ($50-500 ext{ Pa}\cdot ext{s}$, such as sweetened condensed milk, processed cheese, and khoa).
Key Formula or Approach:
\[ \text{Viscosity Agitator Selection: Propeller } (< 2\text{ Pa}\cdot\text{s}) \rightarrow \text{Turbine } (< 50\text{ Pa}\cdot\text{s}) \rightarrow \mathbf{Anchor \text{ } Type } (\mathbf{50 - 500\text{ Pa}\cdot\text{s}}) \]
Step 2: Detailed Explanation:
In mixing technology and fluid rheology for dairy processing vessels:
1. Propeller Type (B): High-speed ($400 - 1500\text{ rpm}$), axial-flow impellers; effective only for low-viscosity liquids ($< 2\text{ Pa}\cdot\text{s} / < 2000\text{ cP}$, e.g., fluid milk). In high-viscosity pastes, propellers simply carve an air hole without moving the bulk liquid.
2. Anchor Type Agitator (A):
- Operates at low rotational speeds ($10 - 50\text{ rpm}$) with a sweeping contour matching the vessel inner wall contour with minimum clearance ($2 - 5\text{ mm}$).
- Frequently fitted with Teflon scraping blades (scraped-surface agitator).
- Ideal for High-Viscosity Products (50 to 500 Pa·s) such as Sweetened Condensed Milk, Processed Cheese molten spreads, Butteroil cooling, and Khoa desiccation, preventing localized burn-on and promoting laminar bulk turnover.
Step 3: Final Answer:
Hence, the agitator suitable for high viscosity products is Anchor type, matching option (A).
Agitator impeller selection by fluid viscosity: Marine propellers are suited for low-viscosity fluids ($< 2 ext{ Pa}\cdot ext{s}$), paddle agitators for moderate viscosity ($< 50 ext{ Pa}\cdot ext{s}$), and close-clearance Anchor-type Helical ribbon agitators for high-viscosity non-Newtonian pastes ($50-500 ext{ Pa}\cdot ext{s}$, such as sweetened condensed milk, processed cheese, and khoa).
Key Formula or Approach:
\[ \text{Viscosity Agitator Selection: Propeller } (< 2\text{ Pa}\cdot\text{s}) \rightarrow \text{Turbine } (< 50\text{ Pa}\cdot\text{s}) \rightarrow \mathbf{Anchor \text{ } Type } (\mathbf{50 - 500\text{ Pa}\cdot\text{s}}) \]
Step 2: Detailed Explanation:
In mixing technology and fluid rheology for dairy processing vessels:
1. Propeller Type (B): High-speed ($400 - 1500\text{ rpm}$), axial-flow impellers; effective only for low-viscosity liquids ($< 2\text{ Pa}\cdot\text{s} / < 2000\text{ cP}$, e.g., fluid milk). In high-viscosity pastes, propellers simply carve an air hole without moving the bulk liquid.
2. Anchor Type Agitator (A):
- Operates at low rotational speeds ($10 - 50\text{ rpm}$) with a sweeping contour matching the vessel inner wall contour with minimum clearance ($2 - 5\text{ mm}$).
- Frequently fitted with Teflon scraping blades (scraped-surface agitator).
- Ideal for High-Viscosity Products (50 to 500 Pa·s) such as Sweetened Condensed Milk, Processed Cheese molten spreads, Butteroil cooling, and Khoa desiccation, preventing localized burn-on and promoting laminar bulk turnover.
Step 3: Final Answer:
Hence, the agitator suitable for high viscosity products is Anchor type, matching option (A).
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