Podcast
Questions and Answers
What is the recommended detention time range for a completely mixed flow reactor (CMFR) performing sweep coagulation?
What is the recommended detention time range for a completely mixed flow reactor (CMFR) performing sweep coagulation?
- 7 to 14 minutes
- 1 to 7 seconds (correct)
- 1 to 7 minutes
- 7 to 14 seconds
Which type of impeller provides more turbulence and is preferred for rapid mixing in stirred tanks?
Which type of impeller provides more turbulence and is preferred for rapid mixing in stirred tanks?
- Radial-flow impeller (correct)
- Jet impeller
- Axial-flow impeller
- Magnetic impeller
Why should tanks be horizontally baffled into compartments for mechanical mixing in stirred tanks?
Why should tanks be horizontally baffled into compartments for mechanical mixing in stirred tanks?
- To minimize short circuiting (correct)
- To maximize vortexing
- To increase short circuiting
- To decrease residence time
What is the purpose of using dual impellers in a tank?
What is the purpose of using dual impellers in a tank?
Where should chemicals be added for effective rapid mixing in stirred tanks?
Where should chemicals be added for effective rapid mixing in stirred tanks?
What is the geometric ratio range for H/D (either) in tank and impeller geometries?
What is the geometric ratio range for H/D (either) in tank and impeller geometries?
According to Rushton (1952), how is the power imparted to the liquid in a baffled tank by an impeller typically described?
According to Rushton (1952), how is the power imparted to the liquid in a baffled tank by an impeller typically described?
Why does the volume of a rapid-mix tank seldom exceed 8 m3?
Why does the volume of a rapid-mix tank seldom exceed 8 m3?
What is the purpose of using both axial-flow and radial-flow impellers when dual impellers are employed?
What is the purpose of using both axial-flow and radial-flow impellers when dual impellers are employed?
What G value range is recommended for sweep coagulation in a continuous-flow stirred tank reactor (CSTR)?
What G value range is recommended for sweep coagulation in a continuous-flow stirred tank reactor (CSTR)?
How does the use of two impellers on the shaft impact mixing efficiency?
How does the use of two impellers on the shaft impact mixing efficiency?
What does D represent in the equation for power imparted to liquid by an impeller?
What does D represent in the equation for power imparted to liquid by an impeller?
What is the term used to specify the element size in an in-line static mixer?
What is the term used to specify the element size in an in-line static mixer?
What is a disadvantage of in-line static mixers?
What is a disadvantage of in-line static mixers?
What does the coefficient of variation with time (COV) measure in the context of selecting static mixers?
What does the coefficient of variation with time (COV) measure in the context of selecting static mixers?
What is a key advantage of in-line static mixers compared to other mixers?
What is a key advantage of in-line static mixers compared to other mixers?
Why are in-line static mixers suitable for applications where no external energy source can be used?
Why are in-line static mixers suitable for applications where no external energy source can be used?
What parameter specifies the element size in an in-line static mixer?
What parameter specifies the element size in an in-line static mixer?
