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A medical investigator is proposing to use radioactive spheres for thermal ablation of tumors. The idea is that the radioactivity will generate heat at a constant, uniform rate, G (J m-3 s-1), that will raise the temperature of the sphere relative to its surroundings.
a) Develop an equation for the heat flux at the surface of the sphere (macroscopic balance).
b) Determine the temperature distribution in the sphere (microscopic balance).
c) Estimate the heat generation rate in the sphere given
Core temperature = 60 °C
Surface temperature = 45 °C
Sphere radius = 0.5 mm
Sphere thermal conductivity = 27.5 W m-1 K-1
The bottom of a large, 5-gallon plastic bucket bows when the bucket is filled with water. The deflection of the bottom surface, ?, is a function of the bucket diameter, D, the depth of water, h, the specific weight of the water, ?, the thickness of t..
design of a vacuum distillation plant for purification of glycerin by-product from a biodiesel plant.
A spherical container of outer diameter 2.5 m is buried below the wrath’s surface. The distance of the center of the container to the earth surface is 10 m. The container issued to temporarily store radioactive wastes where heat is generated at a rat..
When a positron and an electron meet, they are both annihilated into pure energy. Calculate how much energy (in MeV) is released in this reaction assuming that each particle is moving at 50% the speed of light. For this question use the classical def..
a piston-cylinder device containing water undergoes a thermodynamic cycle consisting of the following three
a gas may be considered rare?ed that is it can not be studied with theories based on the continuum assumption if it
A closed system consisting of 8.25 lb of a gas undergoes a process during which the relation between pressure and volume is pV^n = constant. The process begins with p1 = 18 lbf/in^2 , v1 = 1.25 ft^3 /lb and ends with p2 = 53 lbf/in^2 , v2 = 0.5 ft^3 ..
a 600 mw steam power plant operates on a simple rankine cycle. steam enters the turbine at 40 mpa and 500oc and is
Module FEA - FINITE ELEMENT ANALYSIS , Provide answers to all questions. Note that assignment part 2 carries 60% of the marks for the course.
A 5.23 ft3 rigid tank contains saturated refrigerant-134a at 100 psia. Initially, 12 percent of the volume is occupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowed to escape slowly from the tank...
consider a piston-cylinder device that contains 0.5m3 of saturated water vapor at 0.2mpa and where the piston initially
What is the difference between the specific internal energy of a mixture of saturated water liquid and vapor with a quality of 10 percent (x = 0.1) at 200 degrees C and 100 degrees C.
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