Identify the likely corrosion mechanisms at the following locations: a. Hip stem made of titanium coupled with a cobalt chromium head b. Nitinol stent c. Fracture fixation plate made of stainless steel

A packed bed of uniform spherical particles of diameter, d= 2.5 mm, density ρs= 4000 kg/m3 , and voidage e= 0.45 is fluidised by means of a liquid of viscosity μ= 1 mN s/m2 and density ρ= 900 kg/m3 . (a) Starting from Carman’s and Ergun’s equations reported in the attached equations sheet, derive the corresponding expressions for the minimum fluidising velocity, umf, for both equations and explain their meaning.

A falling-head permeameter containing a silty clay loam soil sample has a sample diameter of 10 cm, a falling-head tube of diameter 2 cm, and a sample length of 4 cm. If the initial head is 15 cm. It falls 4 cm over a period of 6 hours. (a) Find the hydraulic conductivity of the soil sample in m/s and ft/d.

(b) What would be the hydraulic head after 12 hours?

(c) How long would it take for the hydraulic head to drop to 95% of the initial value?

An ideal gas is expanded from 5 bars to 1 bar through isentropic(reversible and adiabatic) operation of a turbine. For ambient conditions at 25°C and 1 bar, calculate the exergy of the turbine when the gas inlet temperature to the turbine is:

I) above ambient conditions at 250°C (8marks)

ii) below ambient condition at -50°C (8marks)

iii) comment on your answer to I and ii above (4marks)

(Cp=1.0KJ/Kg.K , n=1.4)

Carbon dioxide dissolved in soda can escape from the PET bottle slowly by means of diffusion. How long does it take for the soda to lose 10% of its original concentration? The following information might be useful: The inside surface of the bottle can be assumed to be saturated with carbon dioxide. The outside surface concentration can be neglected. It can be assumed that diffusion only takes place through the walls of the cylinder and not through the top or bottom. The bottle can be considered as a cylinder.

Diffusivity of CO2 in PET = 2×10-13 m2 /s;

Inner diameter of the bottle = 0.08 m;

Height of the bottle = 0.2 m;

Solubility limit of CO2 in PET = 10 kg CO2 per m3 of PET;

PET thickness = 0.5 mm;

Initial concentration of CO2 in cola = 7 g/L

State whether the following statements are CORRECT or FALSE. If statement is FALSE, correct it

. 1- Smelting is a process that is used to extract Aluminium from ore

. 2- To measure the mechanical property of a material, in non-destructive testing, you need to destroy the specimen.

mixture of 10 kmol of 70 mol% benzene in toluene is distilled at atmospheric pressure using differential distillation with a constant boil up the rate of 10 mol/min. When 50% (by mole) has been vaporized, report the residue composition, the average vapor composition, the temperature of the still, and how long the process takes using :

1. K-constant=1.48

2.alpha constant=2.41

I am currently pursuing my chemical engineering degree. I want to know, if i want work in chemical industry in future, what are the most important Subject (specific topic) / concept which are important from industry perspective (list them). Also list some of most important book that every chemical engineer should have. Thankyou!!

Explain the applications of the solid/vapor equilibrium.

Air at a temperature of 20 0C and 750 mm Hg has a relative humidity of 80%. Calculate,

(i)The molal humidity of the air

(ii)The molal humidity of this air if its temperature is reduced to 10 °C and pressure increased to 2000 mm Hg condensing out some of the water

(iii)Weight of water condensed from 1000 litre of the original wet air

Vapour pressure of water at 20 °C = 17.5 mm Hg

Vapour pressure of water at 10 °C = 9.2 mm Hg

A mixture of 85% n-heptane, remaining cyclohexane gas at 1 bar and 308 K is compressed to a final state at 1443.47 K and 64.475 bar. Estimate the enthalpy and entropy changes for the process using residual properties and by the Lee/Kessler correlations. In its initial state, the system may be assumed an ideal gas.

A mixture of 85% n-heptane, remaining methanol gas at 1 bar and 308 K is compressed to a final state at 1220.04 K and 113.575 bar. Estimate the enthalpy and entropy changes for the process using residual properties and by the Lee/Kessler correlations. In its initial state, the system may be assumed an ideal gas.

What do you think of the materials used in Smartphones?

You must write one paragraph, with a topic sentence and supporting ideas, and citations and an APA reference list.