Best mechanical engineering graduate programs:
Concentration
The properties of the feed to an evaporator may demo no odd problems. However, equally the liquor is concentrated, the solution properties may drastically change. The density as well as viscosity may increment amongst corporation content until the oestrus transfer surgery is reduced or the solution becomes saturated. Continued boiling of a saturated solution may elbow grease crystals to shape which oftentimes must move removed to foreclose plugging or fouling of the oestrus transfer surface. The boiling request of a solution likewise rises considerably equally it is concentrated.
Best mechanical engineering graduate programs:
Foaming
Some materials may foam during vaporization. Stable foams may elbow grease excessive entrainment. Foaming may move caused yesteryear dissolved gases inwards the liquor, yesteryear an air leak below the liquid level, as well as yesteryear the presence of surface-active agents or finely divided particles inwards the liquor. Many antifoaming agents tin move used effectively. Foams may move suppressed yesteryear operating at depression liquid levels, yesteryear mechanical methods, or yesteryear hydraulic methods.
Temperature Sensitivity
Many chemicals are degraded when heated to moderate temperatures for relatively brusk times. When evaporating such materials exceptional techniques are needed to command the time/temperature characteristics of the evaporator system.
Salting
Salting refers to the growth on evaporator surfaces of a fabric having a solubility that increases amongst an increment of temperature. It tin move reduced or eliminated yesteryear keeping the evaporating liquid inwards closed or frequent contact amongst a large surface expanse of crystallized solid.