11.10 The following set of data are produced by a temperature-measuring device (first order) that is suddenly immersed into a mixture of ice and liquid water. Initially, the device is in ambient air (20°C). Determine the time constant of this temperature-measuring device. Time (s) Temperature (°C) 0.1 0.5 1 2 3 16.7 8.1 3.3 0.6 0.1

11.10 The following set of data are produced by a temperature-measuring device (first order) that is suddenly immersed into a mixture of ice and liquid water. Initially, the device is in ambient air (20°C). Determine the time constant of this temperature-measuring device. Time (s) Temperature (°C) 0.1 0.5 1 2 3 16.7 8.1 3.3 0.6 0.1

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.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.9P: 3.9 The heat transfer coefficients for the flow of 26.6°C air over a sphere of 1.25 cm in diameter...

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Using the information in Problem 1.22, estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes. 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35W/mKis35C and the air temperature is 20C. Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about 20W/m2K (see Table 1.4), but in a 40-mph wind it increases to 75W/m2K. If frostbite occurs when the skin temperature drops to about 10C, do you advise the skier to wear a face mask? What is the skin temperature drop due to the wind?
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Please answer question with as much detail as possible Please Use the “NCEES FE Reference Handbook 10.0.1” which can be downloaded for Free from https://ncees.org/ as your Reference for tables and formulas
Give True or False for the following: 1.In liquids and gases, heat transmission is caused by conduction and convection 2.The surface geometry is the important factor in convection heat transfer 3. The heat transfer by conduction from heated surface to the adjacent layer of fluid, 4. The heat transfer is increased in the fin when &> 1 5.The unit of the thermal diffusivity is m²/s 6. Temperature change between the materials interfaces is attributed to the thermal contact resistance 7. A material that has a low heat capacity will have a large thermal diffusivity. 8. Heat conduction flowing from one side to other depends directly on thickness 9.Fin efficiency is the ratio of the fin heat dissipation with that of no fin 10.The critical radius is represented the ratio of the convicted heat transfer to the thermal conductivity
To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D;, 1 150 mm and wall thickness f; = 20 mm while the outer steel pipe has an inside diameter of D; 2 = 250 mm and wall thickness t, = tị. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, between the two pipes does not exceed its maximum service temperature of Tp. max = 70°C. The ocean water is at T.0 = -5°C and provides an external convection heat transfer coefficient of h. flowing crude oil is h; = 450 W/m²-K. 0.03 W/m-K) 500 W/m2-K. The convection coefficient associated with the (2) It is proposed to enhance the performance of the…
According to the Law of Cooling of Bodies, the rate of change in a body's temperature over time is proportional to the difference between the body's temperature and the ambient temperature. Consider that T(t) is the body temperature as a function of time, A is the ambient temperature, t is time and k is the proportionality constant. In this context, the mathematical model corresponding to the Law of Cooling of Bodies and the function resulting from its resolution are given, respectively. Check the equation that describes this phenomenon and explain the reason for your answer. dT :-k(T – A); T(t) = (T(0) – A)e¯# + A dt dT = k(T – A); T(t) = (T(0) – A)e*“ + A dt dT :-k(T – A); T(t) = e* + A dt dT = k(T – A); T(t) = e- + A dt dT = k(T – A); T(t) = e“ + A dt
Q2/ A thermometer initially at a temperature of 20°C is suddenly plunged into a liquid bath maintained at 150°C. After time interval of 3 seconds, the thermometer indicated a temperature of 95°C. Determine: a. The time constant of the thermometer. b. The indicated temperature after 5 time constants.
re | https://eagleonline.hccs.edu/courses/156500/quizzes/969413/take Question 39 5 pts Perform the following temperature unit conversions: (a) Convert a temperature of 52°C to 'F °R, and K. (b) Convert a temperature of -40°F to °C, K, and °R. Relevant formulae are given below T (°C) = T (K) - 273.15 T ('F) = T (°R) - 459.67 T(F) = 1.8T (°C) + 32 Upload Choose a File 5 pts tion 40
A K- type thermocouple is used to measure the temperature in a heating process. The length of the bare material is 100mm and thickness is 1.5mm. Find the time constant of the bare material. Турe of Thermo-Material couple K ( Q W/m- (kg/m³)| k) |(J/Kg- oc) J Iron- Constantan 46 8535 345 Kromel- Alumel 35 8738 380 T Copper- Constantan 160 8902 316 Cromel - Contantan 33 8825 336 IN Nicrocil- Nisil 34 8702 376 Pt(30%)Rhodium - B 19 15718 56 Pt(6%)Rhodium Platinum(13%)Rodium 55 16628 99 Platinum Platinum(10%)Rodium - Platinum IS 52.9 16745 99 Time constant of the bare material is, T=
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is a measure of the amount by which a fluid offers a resistance to compression 2. Air contained in a tank is under an absolute pressure of 60 kPa and has a temperature of 60 C. The mass of the air in the tank = 3. Viscosity is a property of a fluid that measures the of a very thin layer of fluid over an adjacent one. 4. When the liquid pressure is dropped below the vapor pressure due to a flow phenomenan, the process is called S. The atmospheric pressure can be measured using a simple device called 6. is an electromechanical device that performs a digital readout. is a non-dimensional quantity to determine the flow type related to its frictional effect
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