3. For laminar free convection from a heated vertical surface, the local convection coefficientmay be expressed as hx=Cx-1/4, where hx is the coefficient at a distance x from the leadingedge of the surface and the quantity C, which depends on the fluid properties, isindependent of x.Obtain an expression for the ratio Пx/hx, where x is the average coefficient between theleading edge (x = 0) and the x-location. Sketch the variation of hx and hx with x.Answer: N/A

Answered: 3. For laminar free convection from a…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.22P

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For laminar free convection from a heated vertical surface, the local convection coefficient may be expressed as hy Cx-1/4, where h, is the coefficient at a distance x from the leading edge of the surface and the quantity C, which depends on the fluid properties, is independent of x. Obtain an expression for the ratio hx/hx, where x is the average coefficient between the leading edge (x = 0) and the x-location. Sketch the variation of h, and hy with x.
A composite plane wall consisting of materials, 1.5-in steel (k = 312 BTU-in/HR.ft2.0F) and 2-in aluminum (k = 1400 BTU-in/HR.ft2.0F), separates a hot gas at Ti = 2000F, hi = 2 BTU/HR.ft2.0F, from cold gas at To = 80 deg F, ho = 5. If the hot fluid is on the aluminum side, find: a) Transmittance, U; b) The heat through 100 sq. ft of the surface under steady state condition and c) The interface temperature at the junction of the metals.
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A camera used for monitoring marine life is placed in water where T.. -5°C and the convection heat transfer coefficient h=1420 W/m²K. The camera is operating, but its battery is experiencing thermal runaway, causing the camera to become very hot, and there is volumetric heat generation, qe inside it. There is no heat generation within the waterproof, protective enclosure surrounding it. 00:08 The camera is already compromised; however, its owner hopes to save the protective case. Each interface (between layers A and B and between layers B and C) must not exceed a temperature of 185°C, or these plastic, protective layers will begin to melt. Approximate the camera and its casing as a composite, rectangular object with flat surfaces. The device's total thickness, L=LA + 2LB +Lc, is much smaller than its area (into the page); therefore, 1-D conduction can be approximated through the layers. On the left surface of layer A, the temperature is measured to be T₁ = 8.0°C, and the temperature on…
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Hello how are you doing ? Please the questions is on the image and all the details thanks you so much for your help
An egg with mean diameter of 40 mm and initially at 20 °C is placed in a boiling water for (4min) and found to be boiled to consumers taste. For how long should a similar egg for same consumer be boiled when taken from a refrigerator at 5 °C. Take the following properties for egg: k = 10 Wim. °C and the heat transfer coefficient (h = 100 W/m. "C) .p= 1200 kJ / kg. "C, C = 2 kJ/ kg. "C,
The fan circulates the warm air on the inside of the windshield to stop condensation of water vapor and allow for maximum visibility during wintertime (see images). You have been provided with some info. and are asked to pick from the bottom table, the right model number(s) that will satisfy the requirement.Your car is equipped with a fan blower setting that allow you to choose between speeds 0, 1, 2 and 3. Variation of the convection heat transfer coefficient is dependent upon multiple factors, including the size and theblower configuration.following image shows the parameters
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2.2: Water at a temperature of T∞= 25°C flows over one ofthe surfaces of a steel wall (AISI 1010) whose temperatureis Ts,1= 40°C and thermal conductivity of steel is 671 w/m.k. The wall is 0.35 m thick, and itsother surface temperature is Ts,2= 100°C. For steadystateconditions what is the convection coefficient associatedwith the water flow?
Q2/ An aluminum sphere weighting 7kg and initially at a temperature of 533K is suddenly immersed in a fluid at 283K. if heat transfer coefficient between the sphere and fluid is 50W/m?.°C. Take density=2707kg/m3, specific heat=0.9KJ/kg.ºC and thermal conductivity= 204W/m°C. Determine th Bi number and And determine the time required to cool sphere to 263k

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