Vertical Tube Evaporator

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Questions and Answers

What is the main disadvantage of using a vertical tube evaporator for thermolabile solutions?

  • Repetitive contact with a hot surface via the influence of central down take (correct)
  • Inability to concentrate solutions
  • High cost associated with operation
  • Limited heat transfer and evaporation rates

Why is a basket tube evaporator unable to concentrate solutions effectively?

  • Continuous convection currents providing better heat transfer
  • Inability to prevent particles from moving down
  • Contact with hot surface via the influence of central down take
  • Presence of narrow tubes between two tube sheets (correct)

What differentiates the operation of a basket tube evaporator from a vertical tube evaporator?

  • Presence of a cylindrical body surrounding the heating surface
  • Movement of solution from bottom to top inside tubes for heat transfer (correct)
  • Use of a wide central down take tube
  • Use of a cover and bottom in the evaporating chamber

Why is a vertical tube evaporator considered more efficient in terms of heat transfer compared to a basket tube evaporator?

<p>Continuous convection currents enhancing heat transfer (B)</p> Signup and view all the answers

Which feature of a long tube evaporator prevents particles from moving down in the narrow tubes?

<p>High uprising velocity of molecules adjacent to the tubes (D)</p> Signup and view all the answers

What characteristic makes basket tube evaporators unsuitable for use with viscous solutions?

<p>Repetitive contact with hot surface via central down take (C)</p> Signup and view all the answers

What type of solutions is the horizontal tube evaporator used for?

<p>Non-viscous solutions that do not deposit crystals (C)</p> Signup and view all the answers

Why is the horizontal tube evaporator considered inefficient?

<p>Low evaporation rate due to the cutting of convection current by horizontal tubes (C)</p> Signup and view all the answers

What type of solutions cannot be processed using a horizontal tube evaporator?

<p>Viscous solutions and thermolabile materials (B)</p> Signup and view all the answers

What is a notable advantage of a horizontal tube evaporator in terms of cost?

<p>Low cost per square meter of heating surface (A)</p> Signup and view all the answers

Why can't a horizontal tube evaporator be used for concentrating viscous solutions?

<p>Continuous cutting of convection current by horizontal tubes (B)</p> Signup and view all the answers

How does heat transfer occur in a vertical tube evaporator?

<p>By natural convection only (A)</p> Signup and view all the answers

Which type of evaporator allows the basket to be removed for cleaning, repairing, and maintenance?

<p>Basket Tube Evaporator (D)</p> Signup and view all the answers

What is a disadvantage of using the Basket Tube Evaporator?

<p>Repetitive contact with hot surfaces (D)</p> Signup and view all the answers

How does heating in the Long Tube Evaporator lead to bubble formation?

<p>Small air bubbles form and increase in number and size over time (B)</p> Signup and view all the answers

Why can't the Basket Tube Evaporator be used for thermolabile solutions?

<p>Due to repetitive contact with hot surfaces (A)</p> Signup and view all the answers

What is the advantage of using a Long Tube Evaporator?

<p>Reduced entrainment (A)</p> Signup and view all the answers

What characteristic prevents the Basket Tube Evaporator from being used for thermolabile solutions?

<p>Continuous contact with hot surfaces (C)</p> Signup and view all the answers

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