None of the given
Q: An experiment was conducted to measure thermal conductivity of a formulated food. The measurement…
A: The thermal conductivity of the product is 0.67143 W/m•K.
Q: A steel tube having k = 46 W/m · ◦C has an inside diameter of 3.0 cm and a tube wall thickness of 2…
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Q: Approximations that are used in fin analysis are No heat generation the fin material…
A: Fin is a extension to a surface that is used to increase the heat transfer from the surface.
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A: Given Fin analysis To find Uncommon boundary condition
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A: We are authorized to answer one question at a time since you have not mentioned which question you…
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Q: c. Short answer You need to calculate the temperature at the free end (tip) of a long fin. The…
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Q: An aluminum pipe has a length of 75 m at a temperature of 18°C. An adjacent steel pipe at the same…
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Q: Example : A steel tube having k =46 W/m °C has an inside diameter of 3.0 cm and a tube wall…
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A: Solution: Mathematical relation for one dimension heat transfer equation is given by,…
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Q: 3. A thin electrical heater is wrapped around the outer surface of a long cylindrical tube whose…
A: Given Internal temperature = 6 C Outer radius = 78 mm Inner radius = 24 mm Thermal conductivity =…
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Q: wall, plastered on one face, has a thermal conductance of 0.36 m2 K/W, an inside surface
A: Handwriting.jpg
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Q: a) Derive the expression for temperature distribution and heat dissipation in an infinite long fin…
A: Fins are surfaces that extend from an item to improve the rate of heat transmission to or from…
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A: Option C is the correct answer.
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Q: 5. The temperature distribution along a fin with insulated tip is given by: mx e
A: Temperature distribution along fin with insulated tip to be find out
Q: An aluminum tube is 200 cm long and has a outside diameter of 2 cm and wall thickness of 5 mm. One…
A:
Q: long pipe with 6cm outside diameter carries hot fluid and so, it is covered with 3cm thick…
A: Given Data D1=6 cm t=3 cm Q2=0.25Q1
Q: An aluminum pipe has a length of 75 m at a temperature of 18°C. An adjacent steel pipe at the same…
A: Using formula, ∆LL=αT
Q: It is proposed to coat a 10mm diameter metal wire with enamel paint (k=0.1 W/m K) to increase heat…
A: Given diameter, d = 10 mm k=0.1…
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A: Free stream temperature is not given in the question. Assuming free steam temperature is 25o C. To =…
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A: 1) True Insulation upto critical radius increase the heat transfer and after critical radius heat…
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A: The gasoline overflow from the tank is Voverflow = 22 liters.
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Q: Effectiveness of the infinitely long fin shows that. Choose the wrong statement If you increase…
A: Let us discuss about effectiveness in infinite long fin. Answer: None of above
Q: A) If you increase cross-sectional area effectiveness will drop B) epsilon is proportional to…
A: Option c is correct none of the above
Q: Calculate the heat loss per linear ft from 2 in. nominal pipe (2.375 in. outside diameter) covered…
A:
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- 2.45 Heat is transferred from water to air through a brass wall . The addition of rectangular brass fins, 0.08 cm thick and 2.5 cm long, spaced 1.25 cm apart, is contemplated. Assuming a water-side heat transfer coefficient of and an airside heat transfer coefficient of , compare the gain in heat transfer rate achieved by adding fins to (a) the water side, (b) the air side, and (c) both sides. (Neglect temperature drop through the wall.)Repeat Problem 1.35 but assume that instead of surface temperatures, the given temperatures are those of the air on the left and right sides of the wall and that the convection heat transfer coefficients on the left and right surfaces are 6 and 10W/m2K, respectively.1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
- One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?A section of a composite wall with the dimensions shown below has uniform temperatures of 200C and 50C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA=70W/mK,kB=60W/mK, kC=40W/mK, and kP=20W/mK, determine the rate of heat transfer through this section of the wall and the temperatures at the interfaces. Repeat Problem 1.34, including a contact resistance of 0.1 K/W at each of the interfaces.1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in Appendix 2, Table 11.
- 1.37 Mild steel nails were driven through a solid wood wall consisting of two layers, each 2.5-cm thick, for reinforcement. If the total cross-sectional area of the nails is 0.5% of the wall area, determine the unit thermal conductance of the composite wall and the percent of the total heat flow that passes through the nails when the temperature difference across the wall is 25°C. Neglect contact resistance between the wood layers.2.15 Suppose that a pipe carrying a hot fluid with an external temperature of and outer radius is to be insulated with an insulation material of thermal conductivity k and outer radius . Show that if the convection heat transfer coefficient on the outside of the insulation is and the environmental temperature is , the addition of insulation actually increases the rate of heat loss if , and the maximum heat loss occurs when . This radius, is often called the critical radius.A hollow sphere with inner and outer radii of R1 and R2, respectively, is covered with a layer of insulation having an outer radius of R3. Derive an expression for the rate of heat transfer through the insulated sphere in terms of the radii, the thermal conductivities, the heat transfer coefficients, and the temperatures of the interior and the surrounding medium of the sphere.
- Effectiveness of the infinitely long fin shows that... Choose the wrong statement A) If you increase cross-sectional area effectiveness will drop B) epsilon is proportional to thermal conductivity C) None of the above D) epsilon is inversely proportional to convective heat transfer coefficient E) If you increase perimeter effectiveness will increaseCalculate the quantity of heat conducted per minute through a duralumin circular disc 143 mm diameter and 46 mm thick when the temperature across the thickness of the plate is 10 ℃. Take the coefficient of thermal conductivity of duralumin as 33,000 Btu/hr-ft-R.Discussions: Use illustrations if necessary.1. Explain the meaning of heat transfer and its concepts.2. Enumerate and discuss the different modes of heat transfer and their applications.3. Explain the concept of thermal resistances and their limitations.4. Explain the concept of thermal contact resistance and their significance on heattransfer of walls.5. Explain the concept of critical radius of insulation on spherical and cylindrical walls.