What is diametral pitch, and why is it an important parameter in a gear mesh?
In: Mechanical Engineering
For the factors / conditions listed, select those that tend to alleviate creep deformation for a metal sample with a random polycrystalline microstructure.
a. Raise the service temperature that the part is exposed to.
b. Substitute the metal for one with a higher melting point.
c. Decrease the applied stress on the metal part.
d. Decrease the average grain size of the metal part.
e. Increase the grain count of the metal part (for a fixed volume).
f. Apply an insulative (non-structural) ceramic coating to the part.
g. Switch to a single crystal or textured polycrystalline microstructure.
In: Mechanical Engineering
Solution for problem one (P1) below:
ME 311 Thermodynamics I 1 Homework 5 Problem from Cengel and Boles 8th Edition
P1) Carbon dioxide flows steadily in a pipe at 3000 kPa, 31 °C, and at a rate of 1.5 kg/s.
Determine the density of carbon dioxide using
(a) the ideal gas law
and
(b) the compressibility chart.
In: Mechanical Engineering
Liquid mercury at 0.5 kg/s is to be heated from 300 to
400 K by passing it through a 50-mm-diameter tube
whose surface is maintained at 450 K. Calculate the
required tube length by using an appropriate liquid
metal convection heat transfer correlation. Compare
your result with that which would have been obtained
by using a correlation appropriate for Pr>= 0.7.
In: Mechanical Engineering
(A) Derive Bernoulli's Equation from Pressure, Kinetic Energy and Potential Energy
(B) Express Bernoulli's equation:
- Per unit mass
-Per unit volume
- In terms of heads
In: Mechanical Engineering
I need a full article on leadership and mechanical engineering two full pages
In: Mechanical Engineering
some examples of people who have a great
leadership?
In: Mechanical Engineering
Imagine a diverging channel in place of the jet engine. Air enters the channel supersonically and accelerates further in the diverging geometry. The exit velocity is an even faster jet which would provide thrust to the aircraft. In this design no energy is required in the form of combustion. Would this design work? If yes, why, and if not, why not? Use equations to explain your physics based arguments. You can use a quantitative example to make your point.
In: Mechanical Engineering
An adiabatic mixing chamber with operating pressure of 180 kPa is used to mix cold water and hot water. The hot water enters at 80°C with mass flow rate of 4.1 kg/s. The cold water enters the chamber at 39°C and the mixture leaves at a temperature of 45°C. Determine (a) the mass flow rate of the cold water and (b) the rate of entropy generation during this process.
In: Mechanical Engineering
Concept 1: Does turbulent flow or laminar flow have a greater heat transfer coefficient? Why?
Concept 2: For flow over a flat plate, why does the heat transfer coefficient decrease the greater the distance from the leading edge? (in answering, ignore the effects of flow regime transitions. i.e. assume the flow over the plate is all laminar or all turbulent).
In: Mechanical Engineering
Explain why adding Ti or Si can raise the eutectoid temperature of steels? What is the impact of having higher eutectoid temperature on using heat treatment to obtain Bainite? Use the CT or TTT diagram to explain.
In: Mechanical Engineering
A rectangular rosette is mounted on a steel plate having a modulus f elasticity E=200GN/m2 and Poission’s ratio =0.3. The strains measured are ε1=500×10-6; ε2=400×10-6; ε3= -100×10-6. Develop a MATLAB code to compute maximum shear stress and the orientation angle for the principle axis of the stress.
In: Mechanical Engineering
Post a one-page essay sharing your position on the following video clip:
Professor' Kaku's talk on The Future of Technology (https://www.youtube.com/watch?v=59Ejxp1tRss)
In: Mechanical Engineering
1.Can i use this material for making wheel(rim) for water hose cart? 2.Which kind of procuction made of this material? 3.What is manifacturing method of produce of them?*polytrimethylene terephthalate(PTT) *PBT * PC+PBT
In: Mechanical Engineering
An air engine is modeled after the ott cycle. Assume ideal gas
and air standard cold valus for properties. Intake air is at 100kPa
and Temperature of 27°C. The compression ration is 8:1. The heat
added during ignition is 1740 kJ/kg
a) Draw and Label the Pv and Ts diagrams for the Otto cycle
b)Find the specific volume at intake state #1
c) Find the temperature at the end of the compression stroke
d) Find the Pressure at the end of the compression stroke
e) Calculate the efficiency for the cycle
f) For the Carnot air heat engine working between the same
temperature resevoirs, what is the Carnot Efficiency
In: Mechanical Engineering