The rate of transfer of a process is equal to the driving force divided by the resistance.
The mass transfer coefficient is the resistance to mass transfer. In mass transfer the driving force is the concentration gradient. The mass transfer coefficient is considered anything that contributes to resistance to mass transfer: thermal and eddy diffusivity, distance, etc.
Fick's law of diffusion describes convective mass transfer as:
N=-c*D*(ca2-ca1)/(z2-z1)
where:
-c is some constant multiplier (unitless)
-The quantity (z2-z1) is the distance between two points. (length i.e. meters)
-D is the mass diffusivity or the diffusion coefficient and is dependent on properties of the substance (such as particle size etc.) and temperature. (units: length2/time i.e. m2/s)
-The quantity (ca2-ca1) is the concentration gradient between the same two points (the driving force) (units: amount/length3 i.e. mol/m3)
-N is the rate of mass transfer (units: mass/(length2*time) i.e. mol/m2*s) )
Putting Fick's law in terms of the mass transfer coefficient kc', yields:
N=-kc'*(ca2-ca1)
where kc'= -c*D/(z2-z1).
You can see that the mass transfer coefficient is in fact a function of the diffusivity.
A broad question, so I will give a broad answer. A driving force is needed and what drives heat transfer is simply temperature differences between two bodies. The mechanism at say a molecular level is really just the exchange of the energy from molecules to molecules. Higher energy molecules will collide with lower energy molecules and voila, you have heat transfer.
a refinery is for oil and a mil is like for grains etc.
Thermal CRacking is caused by heat while catalytic cracking is not caused by heat
Lubricating Oil Is A Thick Fatty Oil (Especially One To Be Used For Lubricating Factory Machinery)
Pre-commissioning is the testing of non-energized systems. Commissioning is the testing of energized systems.
It is the same. ADC=MD.
The difference between factors and coefficient is very distinct. A factor is a quantity which is multiplied with another to give a particular number as the result. A coefficient on the other hand is a multiplier that measures property.
The subscripts tell you how the atoms are bound together. The coefficient tells you how many atoms there are.
What is the difference between an ordinary transformer and resonant coupling energy transfer?
A variable is a part of a term which can change. A coefficient is a numerical constant, associated with a variable. For example, in the term 3x^2 , 3 is the coefficient, while x is a variable.
Habib Nazeri has written: 'The measurement of the heat transfer coefficient between cryolite and ledge'
A constant is just a number that remains same throughout, while a coefficient is one which is followed by one or more variables.
positive temperature coefficient vs. negative temperature coefficient resistance increases or decreases with increase of temperature, respectively.
GUI.
A wire transfer is from one bank to another. A bank transfer is a transfer from one account to another at the same bank.
well i would say that a factor is a number add to another number and it equal something but a coefficient is not really what i know but i think its something similar to a factor
The coefficient is a count of the number of molecules of each substance in a chemical process. The subscript is the number of atoms of an element in each molecule.