Re-derive an expression for average NuL (= hLL/k) for flow over a flat plate by integrating the expression for average hL for a mixed BL. For Rex,cr, use 123456 (keeping the same sequence), and find the constant B (in Eq. 7.38). Also show that for Rex,cr = 500,000, B is indeed equal to 871.
eq. 7.38=> NuL=(0.037 ReL^(4/5)-B)Pr^(1/3)
0.6<=Pr<=60
Rex,c <= ReL <=108
In: Mechanical Engineering
In a low temperature drying system, air at 60°C and 10% Relative humidity passes over a bed of diced carrots at 20 kg-dry air/sec. The rate of water removal from the carrots Is measured by difference in total weight over time and found to be approximately .16 kg-water/sec. In the system described above, calculate the temperature and relative humidity of the air exiting the drying system.
In: Mechanical Engineering
A fuel with a stoichiometric formula of C99H148O56N is being combusted at a rate of 1 metric tonne/hr in 100% excess air.
[1] Calculate the rate of air supply to the combustion chamber.
[2] Calculate the rate of CO2 production from the combustion chamber.
In: Mechanical Engineering
In: Mechanical Engineering
Please prove that in homogeneous nucleation of solidification the critical radius and activation energy are ??? = (? 2??????) ( 1 ) and ???? = (16????3????2 ) 1 , respectively, ????? ??? 3?????2 ???2 in which ? is the surface free energy, Tm is the melting temperature, ?T is the degree of supercooling (Tm - T), and ?Hf is the latent heat of fusion.
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1a. The relative humdity outdoor is 70% and the outdoor temperature is 90 degree F what is the actual partial pressure of water vapor in the air
1b. Humidty ratio (w) is the ratio of the mass of the water (Mw) to the mass of dry air (Mw) note that two partial pressures sum to the total pressure (P =Pa + Pv) derive the equation
w = 0.622Pv / (P-Pv). Use the ideal gas equation for mass
1c. Solve for humidity ratio if the partial pressure of water vapor is 0.1816psia
1d. What is the relative humidity of 70 degree F moist air in a classroom
1e. Estimate the mass (Ibm) of water vapor in the classroom
In: Mechanical Engineering
The spindle speed for T2 is given. Describe in detail a way that the spindle speed could be calculated with only the dynamometer data, basic information about the tools and analysis methods.
In: Mechanical Engineering
Explain in detail a method of using data from a force dynamometer as an unmanned automated monitoring system for a turning process.
In: Mechanical Engineering
Section-I: Technical terms to research and present your reflections in no more than 10 lines along with a figure/table with proper description, when necessary. Highlight key meaningful term(s) in the write up. (directly copying verbatim answers from the book will carry NO points)
1- Strain hardening and annealing
2- Casting processes for manufacturing components
3- Solid solution and application
Text Book- The Science and Engineering of Materials, Askeland et al. (seven edition)
In: Mechanical Engineering
Outline the three typical grain structures that develop in cast components. Explain how a fine grain size may be promoted in casting.
In: Mechanical Engineering
How an engineer with the proficiency in Engineering Economics shall handle the situation of which the defender and challenger could co-exist in an engineering related environment ?
Explain and elaborate with full details.
In: Mechanical Engineering
Air enters the compressor of an ideal Brayton refrigeration cycle at 140 kPa, 270K and is compressed to 420 kPa. At the turbine inlet, the temperature is 320K and the volumetric flow rate is 0.4 m3/s. Determine (i) the mass flow rate, in kg/s; (ii) the net power input, in kW; (iii) the refrigerating capacity, in kW; and (iv) the coefficient of performance.
In: Mechanical Engineering
An ideal cold air-standard Otto cycle has a compression ratio of 9.2. At the end of the expansion process, the pressure is 110 psi, the temperature is 1020 °R and the specific volume is 3.435 ft3/lbm. The heat rejection from the cycle is 92 BTU/lbm of air. Evaluate specific heat at 100 °F and calculate the following by hand: What is the mean effective pressure (psi)? The correct answer is 231.8 psi. Show every step and calculation with units necessary.to find the answer.
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How does ozone is used to clean fruits and vegetables?
How does ultrasonic works in cleaning fruits and vegetables?
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exothermic methods to create a closed system using an immersion heat coil...for 5,000 gallon tank....no judgement all methods or ideas welcome
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