The time at which the concentration of b will reach its

Question

Chemical Reaction Engineering

Question: In an isothermal batch reactor the following reaction is taking place

   k₁ (First Order)         k₂ (Second Order)

  A                B                 C

The feed concentration is 1mol/liter

i) The time at which the concentration of B will reach its maximum value?

ii) The concentration time equation at which the concentration of B will become zero?

HEAT TRANSFER

Question: Consider the flow of a gas with density 1kg/m³, viscosity 1.5 * 10^-5 kg/m-s, and C_P is 846 J/kg K. The thermal conductivity (K= 0.01665 W/mK) in a pipe with diameter D=0.01m, length L= 1m,

The nussult number for a pipe with L/D > 10 and Re >20,000 is given by

Nu = 0.026 Re^0.8Pr^1/3

While the nussult number for laminar flow with Re*Pr*D/L. <10 and Re< 2100 is given by

Nu= 1.86 (Re*Pr* D/L)^1/3

If the gas flows through the pipe with an average velocity of 0.01m/s. Find the heat transfer cofficient.