What is the purpose of the negative sign in Fourier’s law of conduction heat transfer?

Q: The temperature distribution for the plane wall is given in Fig. and here T1 and T2 are the…

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Q: A coolant with a temperature of -20 ° C passes through a copper cylindrical wire. The outer diameter…

A: Given that, Temperature of coolant, T=-20 °C,Outer diameter of wire, do=10 mm,Temperature of air,…

Q: Consider the following cases: Case 1: A rod with specified surface temperature. Case 2: A rod with…

A: Case 2 is the correct answer.

Q: Two metal bars are kept at the same temperature and are aligned with their nearer ends separated by…

A: Given, Distance between two bar = 1 mm αs=10-5 C-1Ls=4 mαI=1.2×10-5 C-1LI=5 m

Q: Choose the correct answer for heat: Select one: O a. Path Function O b. Intensive properties O c.…

A: Extensive properties:  It properties which is depend on the amount of matter. Intensive property: It…

Q: Calculate the heat transfer per unit area of ​​a concrete which has a thickness of 300 mm, the…

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Q: A nuclear reactor can be modelled as the plane wall shown in figure below. The thermal conductivity…

A: Given Data The thermal conductivity of wall is: k=12 W/m.K The heat generation rate is:q˙G=106644…

Q: The rod A has a cross sectional area 2376 mm2, modulus of elasticity 68 Gpa and thermal expansion…

A: Apply the concept of thermal deformation is equal to the axial deformation. Now substitute the…

Q: The temperature gradient is inversely proportional to the cross sectional area for one dimensional…

A: Solution: Mathematical relation for one dimension heat transfer equation is given by,…

Q: A = 1m² T1 = 1 K h₁=1 W/m²K T₁ x=0 q=0W/m³ k= 1W/mK L=1m x=im Ton2 = 1 K h₂=1 W/m²K (4) Consider a…

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Q: Choose the wrong statement. Convective heat transfer depends on       surface area of the material…

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Q: A hollow cylindrical copper conductor 1.27cm. i.d. and 5.1cm. o.d. carries a current density 5000…

A: The inside diameter is di=1.27 cm. The outer diameter is do=5.1 cm. The thermal conductivity is…

Q: II M Q1/A long cylindrical shell of inner radius R, = 1 cm, outer radius R₂ = 2 cm, and length L =…

A: Given :The inner radius of cylinder is The outer radius of the cylinder is The temperature is

Q: A 1 m x 1 m plate made of brass (k = 70 W/mK) with a thickness of 5 cm is used a heating element…

A: given; ⇒conductivity (k)=70w/mk⇒ power (q)=1900w⇒at x=5cm ,temperature (T)=2500c=523k

Q: For an extended surface ie. fin, the direction of convective heat transfer from the fin's main…

A: For an extended surface ie. fin, the direction of convective heat transfer from the fin's main…

Q: Given the illustration and data below. Determine the heat lost per day.

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Q: In a conduction heat transfer process through a solid slab layer taking place under steady-state…

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Q: Qi: (50 marks) Find the total heat flux of the composite wall when: KA = KC = KF = 15 m. K KB = KD =…

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Q: A composite wall is formed by sandwiching a 0.1 m thickness material between two steel slabs. The…

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Q: A machine element as seen in the figure is made of pure copper. It has an inner diameter of D;=2.9…

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Q: A wall of a house is made from two layers of bricks enclosing a layer of insulation. A radiator is…

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Q: Continuous temperature distribution in a semi-permeable material with laser radiation on it,…

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Q: A temperature difference of 85 •C is impressed across a fiberglass layer of 13 cm thickness. The…

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Q: Identify the correct statement O a. The thermal resistance of conduction decreases with increase in…

A: Option C is the correct answer.

Q: L 2L L A/4 2. Assumption: Surfaces normal to x are isothermal,contact resistance between layers is…

A: Equivalent Thermal Circuit

Q: b) The wall of the furnace is 30.48 mm thick and is insulated from outside. Thermal conductivity of…

A: The given information in the problem is represented in the following attached image:

Q: A team of students tests a material for its thermal conductivity (k).  After 20 minutes in a heat…

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Q: Which of the following statements are correct in the context of thermal conductivity? (Check all…

A: Thermal conductivity: It is a measure of heat flow through the material or it is a measure of how…

Q: Which of the ff. is accounted by the Fourier's Law of Heat Conduction? O Rate of heat in Rate of…

A: Option a is correct

Q: A long hollow cylinder has an inner radius of 1.5 in. and an outer radius of 2.5 in. The temperature…

A: Given: The inner radius of hollow cylinder ri=1.5 in =0.125 ft The outer radius of hollow cylinder…

Q: Three of the following statements are true, but one is false. Indicate which one is false. O…

A: 1) True  Insulation upto critical  radius increase the heat transfer and after critical radius heat…

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.