Problem 1. You are operating a batch bioreactor. At the stationary phase, you turn off the oxygen supply for 5 minutes, and then turn it back on. You obtained the following data from your experiment. What is the oxygen uptake rate and kla for your experiment? (Assume the solubility limit (C*) is 7.3mg/L and use graphing method to find kla)

Time (min) DO(mg/L)
1 3.3
Air off 0 3.3
1 2.4
2 1.3
3 0.3
4 0.1
Air on 5 0
6 0.3
8 1
9 1.6
10 2
11 2.4
12 2.7
13 2.9
14 3

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?