1- The energy transferred from the anterior chamber of the eye through the corneavaries considerably depending on whether a contact lens is worn. Treat the eyeas a spherical system and assume the system to be at steady state. The convectioncoefficient ho is unchanged with and without the contact lens in place. The corneaand the lens cover one-third of the spherical surface area.T heT hAnteriorchamberContactlensCorneaare as follows:Values of the parameters representing this situationr 10.2mm, r 12.7 mm, r3= 16.5 mm, Teoj= 37°C, Teoo = 21°C, ki = 0.35W/m.K, k2 0.80 W/m.K, h 12 W/m2.K, ho 12 W/m2.K.(a) Construct the thermal circuits, labeling all potential and flows form the systemsexcluding the contact lens and including the contact lens. Write resistanceelements in terms of appropriate parameters(b) Determine the heat loss from the interior chamber with and without the contactlens in place(c) Discuss the implication of your results.

Question
Asked Sep 6, 2019
698 views
1- The energy transferred from the anterior chamber of the eye through the cornea
varies considerably depending on whether a contact lens is worn. Treat the eye
as a spherical system and assume the system to be at steady state. The convection
coefficient ho is unchanged with and without the contact lens in place. The cornea
and the lens cover one-third of the spherical surface area.
T he
T h
Anterior
chamber
Contact
lens
Cornea
are as follows:
Values of the parameters representing this situation
r 10.2mm, r 12.7 mm, r3= 16.5 mm, Teoj= 37°C, Teoo = 21°C, ki = 0.35
W/m.K, k2 0.80 W/m.K, h 12 W/m2.K, ho 12 W/m2.K.
(a) Construct the thermal circuits, labeling all potential and flows form the systems
excluding the contact lens and including the contact lens. Write resistance
elements in terms of appropriate parameters
(b) Determine the heat loss from the interior chamber with and without the contact
lens in place
(c) Discuss the implication of your results.
help_outline

Image Transcriptionclose

1- The energy transferred from the anterior chamber of the eye through the cornea varies considerably depending on whether a contact lens is worn. Treat the eye as a spherical system and assume the system to be at steady state. The convection coefficient ho is unchanged with and without the contact lens in place. The cornea and the lens cover one-third of the spherical surface area. T he T h Anterior chamber Contact lens Cornea are as follows: Values of the parameters representing this situation r 10.2mm, r 12.7 mm, r3= 16.5 mm, Teoj= 37°C, Teoo = 21°C, ki = 0.35 W/m.K, k2 0.80 W/m.K, h 12 W/m2.K, ho 12 W/m2.K. (a) Construct the thermal circuits, labeling all potential and flows form the systems excluding the contact lens and including the contact lens. Write resistance elements in terms of appropriate parameters (b) Determine the heat loss from the interior chamber with and without the contact lens in place (c) Discuss the implication of your results.

fullscreen
check_circle

Expert Answer

star
star
star
star
star
1 Rating
Step 1

Consider the system as the eye without the contact lens and observe there are three thermal resistances arranged in series with each other namely convection resistance on the Anterior side of the eye, conduction resistance due to the cornea and convection resistance on the outside of the eye.

 

Write the expression for the convection resistance on the anterior side and the exterior side of the eye considering the fact that it the heat transfer is occurring from only one third of its total surface area.

help_outline

Image Transcriptionclose

1 (Reav) = conv h,A, 1 4 3 47 1 (Roav) h,A conv 1 3 3 hΑπς)

fullscreen
Step 2

Similarly, write the expression for conduction resistance offered by the cornea of the eye by considering the fact that it only covers one third of the total surface area of the eye.

help_outline

Image Transcriptionclose

1 1 (Romnd). 4π (η 3(r-) 4πηηk cornea

fullscreen
Step 3

Draw the thermal circuit for the system ...

help_outline

Image Transcriptionclose

Too,0 Too,i Rrond Yeante (Ran (Reen)i (Ream Too,o Tog i ww 3(a,-9) no 3 $3 hoC4TTi) hi(4nsi) Theamal Ciscuit without Coto ct lens

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Engineering

Mechanical Engineering

Heat Transfer

Related Mechanical Engineering Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: can Boyles law work for hydraulic fluids as it does for compressed air?

A:  Boyle’s law is Gas Law . It is applicable only for ideal gasses .Boyle’s states that for a given am...

question_answer

Q: The rod OA is rotating in the horizontal plane such that θ = 2t3 rad. At the same time, the collar B...

A: Consider the above diagramSo given information is

question_answer

Q: 2. Water at standard atmospheric pressure and temperature fills a sealed, rigid container. If the te...

A: Temperature of the water will be 50CAssume the general parameters as P=pressure, V=volume,T=temperat...

question_answer

Q: A body with a weight of 258 lb changes it velocity from 25 ft/s to 146ft/s. Calculate the change in ...

A: The energy which a body has due to its motion is known as kinetic energy of the body. Mathematically...

question_answer

Q: The wheel consists of a 5.0-kg rim of radius r 260 mm with hub and spokes of negligible mass. The wh...

A: Show the diagram showing a wheel mounted on a yoke rolling on a circular surface. 

question_answer

Q: Technician A says that the front bearing assembly locknuts for RWD vehicles are typically heavily to...

A: A high torque for maintaining the bearing adjustment is required in the FWD vehicles and not the RWD...

question_answer

Q: I was given this image for the purpose of studying for an upcoming exam. No additional info was give...

A: The given figure is related to the problem in which a body is thrown at initial velocity vB and at a...

question_answer

Q: Consider an ice-producing plant that operates on the ideal vapor-compression refrigeration cycle and...

A: Click to see the answer

question_answer

Q: Question 5 A bracket ABCD having a hollow cırcular cross sectuon consists of a vertical arm AB (L = ...

A: Click to see the answer