Given concentration gradient as -80 kg/M^4, the diffusion coefficient as 4 times 10^-11 m^2/s, calculate the...
For a species A with a diffusion coefficient of 10^-6 m^2/s, Estimate the molar flux of the species when at x = 0.02 m is 0.55 mol/m^3, and at x=0.06 m is 0.09 mol/m^3
The steady-state diffusion flux through a metal plate is 5.4 x 10 at a temperature of 727°C and when the I mis concentration gradient is - 3 : Calculate the diffusion flux (same units as flux provided) at 1027°C for the same . Y concentration gradient and assuming an activation energy for diffusion of 125,000 J/mol. Enter your answer in scientific notation with 2 decimal places e.g. 1.2E-3
UTVER VIS Concentration of Nitrogen (wt%): = 0.21 Position in mm= 7.2 Diffusion Coefficient for Nitrogen in Iron at 700°C -8.90E-10 Nitrogen in Iron Heat Treatment Time (hours): = 8 Carburizing Time (hrs): = 7 Steel Alloy Case Depth (mm): 4.8 Steel Alloy New Case Depth (mm) - 9.9 Activation Energy kJ/mol: = 103 Temperature for Problem 3 (Celsius) -809 . Data for Problem 4 Temperature in C: -595 Diffusivity (m2/s) = 5.62E-14 Temperature in C: -702 Diffusivity (m /s)...
Calculate D, diffusion coefficient in m^2/s at the soecified temperature tions Determine the carburizing time necessary to achieve a carbon concentration of 0.47 wts at a position 2.1 mm into an iron-carbon alloy that initially contains 0.13 wt%C. The surface concentration is to be maintained at 1.1 wtC. and the treatment is to be conducted at 1180'C. Assume that Do -6,310ms and Q-113 kJ/mol. The table Tabulation of Error Function Values may be useful
Please show work for problems 1-4 1. Calculate the activation energy for vacancy formation in aluminum, given that the equilibrium number of vacancies at 500°C (773 K) is 7.57 x10m3. The atomic weight and density (at 500°c) for aluminum are 26.98 g/mol and 2.62 g/cm, respectively 2. What point defects are possible for Al,0, as an impurity in Mgo? How many Al ions must be added to form each of these defects? 3. A sheet of steel 4.5 mm thick...
2. a) Show that energy transfer by radiative diffusion implies a non-zero gradient for the radiation pressure which is proportional to the radiant energy flow. b) Bearing in mind that the magnitude of the force per unit volume in a fluid due to the pressure is equal to the pressure gradient, find the radiant energy flux density which can, by itself, support the atmosphere of a star with surface gravity g. c) Show that a star of mass M has...
a) What is the diffusion coefficient (DHCi) at 99 °C for a very dilute solution of hydrogen chloride, HC, in water? The ionic diffusion coefficients in water at 25°C are 9.31 X 105 cm2/s for H and 2.03 X 105 cm2/s for Cl. Start this problem by calculating the ionic |diffusion coefficients at 99 °C from those given at 25 °C assuming the viscosity of water at 25 °C and 99 °C is the same. Assume there is no current...
Determine the diffusion coefficient for glycerine in H 2 O using the following observations: glycerine diffuses along a horizontal, water-filled column that has a cross-sectional area of 2.0 cm 2 . The density step across ∆r /l is 3.0 × 10 −2 kg/m 4 and the steady-state diffusion rate is 5.7 × 10 −15 kg/s.
15. What is the diffusion coefficient (m/s) in water at 25°C of a bovine pancreas ribonuclease (an enzyme that digests RNA) whose molecular weight is 1.369x109 and which is spherical?, Assuming the protein is an unhydrated sphere and its density is 1.414 g/cm'. The viscosity of water is 10- Pas. [Hint: Calculate the radius of the protein and use the Einstein relation to estimate the diffusion coefficient.] (10 pts)
The diffusion coefficient for horse hemoglobin in water is 1.26 × 10–10 m2 s–1 at 40 °C. The viscosity of water at 40 °C is 0.653 × 10–3 kg m–1 s–1. Estimate the radius of hemoglobin assuming the molecule to be spherical and obey Stokes’s law. Comment on the size of Hemoglobin to a corona virus unit which has a diameter of 120 nm.