0
Thermal diffusivity is the density divided by the specific heat of a substance. The TD of polypropylene is around 0.096 meters squared per second.
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
Is polypropylene a petroleum based product?
Yes.
Are fumes from hot plate welding of polypropylene toxic?
yes
What is the Difference between diffusivity and mass transfer coefficient?
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.
Thermal conductivity of petrol?
thermal property of petrol
Is plastic a thermal conductor?
No
What is the physical significance of the thermal diffusivity and How is it defined and what?
Thermal diffusivity signifies the rate of heat transfer into the solid. If it is higher then less time is required for the heat to penetrate into the solid. it is th property of a solid. If we know the mass density,specific heat and thermal conductivity coefficient then we can determine its thermal diffusivity.
The ratio of thermal boundary layer thickness to the concentration boundary layer thickness is?
Lewis No = thermal diffusivity / mass diffusivity .So, NLe = thermal boundary layer thickness/ Concentration boundary layer thickness
A dimensionless number which is a ratio of kinematics viscosity to thermal?
The ratio between the kinematic viscosity and the thermal diffusivity is called the Prandtl Number.
If two bodies are in thermal equilibrium in one frame will they be in thermal equilibrium in all frames?
No., because thermal property like conductivity, diffusivity of two material my not be same in other medium.
What is Definition of thermal conductivity?
The definition of thermal conduction is heat transfer. Thermal conduction is when heat is transferred from one source to another.
What has the author Anna Matvienko written?
Anna Matvienko has written: 'High-resolution measurements of thermal diffusivity of water-alcohol mixtures using a photopyroelectric thermal-wave cavity'
What has the author M di Marzo written?
M di Marzo has written: 'Transient cooling of a hot surface by droplets evaporation' -- subject(s): Experiments, Thermal analysis, Thermal diffusivity
A dimensionless number which is a ratio of kinematics viscosity to thermal diffusivity is known as?
The Prandtl Number is a dimensionless number approximating the ratio of momentum diffusivity (kinematic viscosity) and thermal diffusivity and can be expressed asPr = v / αThe Prandtl number can alternatively be expressed asPr = μ cp / kThe Prandtl Number is often used in heat transfer and free and forced convection calculations. where:ν : kinematic viscosity, ν = μ / ρ, (SI units : m2/s)α : thermal diffusivity, α = k / (ρcp), (SI units : m2/s)μ : dynamic viscosity, (SI units : Pa s)k: thermal conductivity, (SI units : W/(m K) )cp : specific heat, (SI units : J/(kg K) )ρ : density, (SI units : kg/m3 ).answered by : eng_moom
What has the author Ray H Cornell written?
Ray H. Cornell has written: 'Measuring thermal diffusivities of high epxlosives by the flash method' -- subject(s): Thermal diffusivity, Measurement, Explosives, Flash radiography
What has the author W K Sawyer written?
W. K Sawyer has written: 'Addendum to a diffusivity model for fluid flow and heat conduction in porous media (MERC/SP-77/2)' -- subject(s): Mathematical models, Oil wells, Thermal diffusivity, Hydraulic fracturing
What has the author S van Vaerenbergh written?
S. van Vaerenbergh has written: 'Morphological stability of a binary alloy' -- subject(s): Stability, Thermal diffusivity, Binary systems (Metallurgy)
Diffusivity coefficient for toluene in air?
molecular diffusivity of toluene in the air is 8.14 × 10−6 m2/s
