Fluid Dynamics of Fire - Assignment Example

Area of a circle = πr2 = 5.76R2 = 5.76/π = 1.83 = r = 1.35The critical diameter is 1.35 + 1.35 = 3.0 mQuestion 2Lower flammability limits of mixtures of combustible gases can be calculated using Le Chatelier's mixing rule for combustible volumeLm = 100/(x1/L1 + x2/L2 + . xn/Ln) %( vol)Where:Lm = upper/lower flammability limit of the gas mixtureLi = upper/lower flammability limit of component iXi = concentration of component I in the gas mixtureMixed fuel is composed of methane (volume percent is 0.35), carbon monoxide (0.35), and hydrogen (0.30)Lm =100/ (35/4.

4 + 35/12 + 30/4) = 100/ (7.95 + 2.92 + 7.5) = 18.37 is the lower flammable limit of the concentration.Question 3Question 4Infrared thermal radiation = 1015Hz, BBC radio 92.8 MHzBBC = 92.8 x 1000 = 92800HzSpeed of sound = 344m/sThe wavelength of the thermal radiation = speed of sound in the air/frequency=344/ 1015= 0.339mThe wavelength of the BBC radio = 344/92800= 0.004mThe wavelength of thermal radiation is larger than that of BBC radio. This indicates that the higher the frequency the smaller the wavelength.

Question 5Question 6Question 7Question 8The Stefan-Boltzmann Law can be expressed asΕ = 0.85q = ε σ T4 AWhereε = emissivity of the objectAnd 5.6703 10-8 W/m2K4 is the Stefan-Boltzmann Law constantQ= 0.85 x 5.6703 10-8 = 4.82 x 108 W/m2Question 9IUPAC nomenclatureThe formal naming of haloalkanes should follow IUPAC nomenclature, which puts the halogen as a prefix to the alkane. For example, ethane with bromine becomes bromoethane, methane with four chlorine groups becomes carbon tetrachloride.

However, many of these compounds have already an established trivial name, which is endorsed by the IUPAC nomenclature, for example, chloroform (trichloromethane) and methylene chloride (dichloromethane). For unambiguity, this article follows the systematic naming scheme throughout.CFCs have greatly contributed to the depletion of the ozone and this led to their phase out at a given time. The compounds also enhance the greenhouse effect because of high concentrations. Low concentrations of the compounds lead to an increase in their effects in line with their mass.

Question 10Chemical reaction rates of temperatures at three temperatures – 300, 600, and 1200 K. The activation energy is 110 kJ/mole