Chemical Engineering - Fluid Mechanics - Discussion

The correct answer is: more power than.

Explanation:

Pitched-blade turbines and straight-blade turbines are both used for mixing in agitated vessels, but they differ significantly in how they move fluid and in their power consumption.

Pitched-Blade Turbine:

Blades are angled (typically 45°).
Produces axial and radial flow.
Promotes better mixing and top-to-bottom circulation.
Draws more power due to the additional axial thrust and flow resistance.


Straight-Blade Turbine:

Blades are vertical (not angled).
Produces primarily radial flow.
Less efficient mixing, especially for suspending solids or gas dispersion.
Consumes less power than the pitched-blade design.

A pitched-blade turbine draws more power than a straight-blade turbine.

The pitched blades create a better flow pattern and increase the turbulence, allowing for improved mixing and higher shear forces. This design is more efficient for applications that require greater fluid movement and mixing, such as in chemical processing and wastewater treatment.

Pitched blade turbine and propeller both are axial flow impeller and paddle, flat blade turbine, flat disc turbine are radial and tangential flow impellers.