-3-A piece of copper as shown in figure is initially at 150 C when suddenlyimmersed in an environment at 38 C. Determine the Biot number and findthe piece temperature after 1 minute,a) if the environment is water with h= 50 W/m2 Kb) if the environment is air with h= 12 W/m2 KData: k = 374 W/m K, c, 0.381 kJ/kg K, and p= 8938 kg/m3.Answ(a- Bi=0.0008913 ; T=136.1C b- Bi=0.0002139 ; T=146.5C).4 cm4 cm

Answered: Image /qna-images/answer/06c45bec-9424-47ff-b828-92cba5ac42df.jpg

Answered: a) if the environment is water with h…

Engineering

Mechanical Engineering

a) if the environment is water with h 50 W/m2 K b) if the environment is air with h= 12 W/m2 K

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.82P: Discuss the modes of heat transfer that determine the equilibrium temperature of the space shuttle...

See similar textbooks

Related questions

Q: Ew =w, + ſkc.s.P(7 aš)– Ic.s.F d$ + W Eletric + WM IIIa.3.2 IIIa.3.10 CV. Magnetic +... C.S. e =u+…

A: Given: To obtain:

Q: The ceiling of a 6 m² area of a cold storage (h = 27 W / m² ° C) where the air temperature is kept…

A: Given data: Area of the ceiling, A = 6 m2. The temperature of the air inside the cold storage, Ti =…

Q: A truncated cone 30 cm high is constructed of aluminum. The diameter at the top is 7.5 cm, and the…

Q: 78.A boat going from salt water (sp. gr. = 1.03) to fresh water (sp. gr. = 1.0) sinks 7.82 cm and…

A: To find original displacement

Q: 1000 W/m of radiant energy is incident upon a surface, out of which 300 W/m² is absorbed, 100 W/m is…

Q: A homeowner in Allentown, PA installs a 60° south-facing solar collector that (on the average over…

A: Given Data, Power of electric heater = 1 KW Electricity rate = $0.11 per KWh Payback period = 5…

Q: The value of global solar radiation is Select one: 11 a. 1.8 X10' MW 2 b. 1353 W/m 2 c. 1000 W/m d.…

Q: A certain solar collector can absorb 3500 Btu in 9.2 h. Another panel is added, and together they…

A: Given data: The heat absorbs by collector 1, Q1=3500 Btu. The heat absorbed by both the collectors,…

Q: An office for seating 30 occupants is to be maintained at 22°C DB and 55% RH. The outdoor conditions…

Q: (c) A resistant heater jacket 6.5kW is wrapped around a water bath for 240 minutes to raise the…

A: Dear student, According to the guidelines I am allowed to answer only one…

Q: Question 2 Water flows through a pipe at an average temperature of T = 50°C. The inner and outer…

A: Given Data Electric heater power is : Q˙s=300 W Length of pipe is : L=1 m Inner radius of pipe is…

Q: 1. A man expends 100J of work moving a box up an inclined plane. The amount of work produced is 80J.…

A: We are suppose to solve only one question. Please post other question as a separate question.

Q: 12. Assuming that the Philippines is consuming 3.5×10^20 kWh of electrical energy in one year and…

A: Given Data. E= 3.5×1020 kWh Efficiency = 32%

Q: A pneumatic utility device is actuated by a linear actuator of 10 cm bore and 3 cm rod diameter.…

A: Write the given data with suitable variables. D=10 cm=100 mm10 mm1 cmd=3 cm=30 mm10 mm1 cmL=30…

Q: Most of us have an electric heater at home. Electric heaters operate at 1500 W (1.5 kW) which means…

Q: k = 150 N/m P = 50 N - 50 cm www 2 A kg 30° 10 cm p = 0.1 ww A kg

Q: A radiant heating lamp has a surface temperature of 800 K with ε = 0.6 How large a surface area is…

A: Data given- T = 800 K ε = 0.6 Q = 350 W

Q: Which house uses more energy. Haron's house in June or Areum's house in December? Why do you think…

A: Given question: Which house uses more energy : Haron's house in June or Areum's house in December?…

Q: An office for seating 30 occupants is to be maintained at 22°C DB and 55% RH. The outdoor conditions…

Q: 1500# 1500# 1500# 1500# 12' K I

A: In this problem, following steps will be taken 1. Determine the reactions at the supports.' 2. Using…

Q: H.W: A 700-N marine in basic training climbs a 10-m vertical rope at uniform speed in 8 s. What is…

A: Work is a scalar quantity. It is the product of force and displacement along the force. Unit of work…

Q: Water is pumped from a lake to a storage tank 20 m above at a rate of 100 L/s while consuming 25 kW…

Q: A water jet consumes "3X50"W for 126 hours a week. What is the energy consumed (kWh) for a one-year…

A: Given data: Energy consumption for a week = 3 x 50 W = 150 W/week

Q: A gas undergoes a thermodynamics expansion process as shown in Figure 1. Process ab represents the…

Q: 12. A piece of copper wire is initially at 150 C. We now expose this wire to air at 38 C. Find a)…

Q: A 50 kg weighted foodstuff with a specific temperature of 3.18 kj / kgK is heated in an oven by…

Q: Q2: A person of skin temp. of 30 K and body surface area 1.75 cm, find: (a): net total power if he…

A: Given: The skin temperature, T = 30°C The area, A = 1.75 cm^2 The wall temperature, Tw = 22°C The…

Q: 8.1 The execution of a cyclic process by a closed system involves the following four heat…

A: Given data as per question Q1=50 Kcal=209 kjQ2=−75 Kcal=−313.8 kjQ3=125 Kcal=522.5 kjQ4=−40…

Q: Havard University campus has 200 classrooms and 400 faculty offices. The classrooms are equipped…

Q: A 220-V electric hot-water heater warms 0.72 Liters/minute of water (c = 4.18 kJ/kg,K, density =1000…

Q: Steam enters a turbine with a pressure of 700 psia, h = 1403 Btu/lbm, u=1272 Btu/lbm, and flow of 14…

A: Given data: The pressure at the entry is P1=700 psia. The enthalpy at the entry is h1=1403 Btulbm…

Q: An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if…

A: An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if…

Q: Second Law of Thermodynamics A heat pump is used for cooling in summer and heating in the winter.…

Q: What is the monthly energy output for a 500-W solar module operating for 6 sun-hours in a day with a…

A: Given Data: Rating of solar module 500 W Time of operation, t=6 hours

Q: An electric home stove with 3 burners and microwave is used in preparing a meal as follows. Burner…

A: Given:Number of burners=3,Number of microwave=1,Time to use burner 1, t1=20 minutesTime to use…

Q: b) the change in internal energy in kJ O 208 О 308 O 178

Q: Q5: Determine which removes heat from the food compartment at a rate of 6000000 J/h for each 1200 W…

Q: An office for seating 30 occupants is to maintained at 220C DBT and 55% RH. The outdoor conditions…

A: Write the given information. Draw the flow diagram of the given air conditioning system.

Q: State p (bar) h(kJ/kg) 1 12 271 1 2 261.8 0.9995 7 86.78 12 87.3 Determine the solar collector…

A: Given data : Rate of energy input to the collectors from solar radiation = 0.3 kW/m2 percentage of…

Q: Find the emissivity of a man whose skin has area of 1.7 m^2 subjected of intense solar radiation…

Q: Hot Reservoir HE 1 HE 2 Он e QL Cold Reservoir W₁ net,out, 1 W₁ net,out, 2 Let's calculate for the…

Q: 6. Performance of USM process is better in case of a) Electrically conductive work material b) work…

A: d) no such constraint

Q: (a) Use the following data to calculate the area of solar domestic hot water collector that would be…

A: Given Temperature of water required by the family is Th=60°C. Temperature of supply water is…

Q: A 5 kW electric motor driving a pump has an efficiency of 85%. Determine the losses encountered in…

A: Electric motor power, PM=5 kWPump efficiency, ηpump=85%

Q: A thin board of 0.5 cm thickness is exposed to a fluid of T, = 22°C and h = 30 W/m².K from one side…

Q: A liquid of specific gravity of 1.75 flows in a horizontal 6 cm diameter pipe. The total energy at a…

Q: There are 40 people sitting in a 20°C room with 60 m² area and 3 m height ceiling. A single person…

A: Given: Number of people= 40 A=-20 m2 Heat produced by single person= 120 W Ti= 20oC To= 40oC Load on…

Q: A solar PV system generates 100 kw-hr of electricity per month. If the rated power of the system is…

A: Given:Energy generated, Eg=100 KW-hr/monthrated power, P=1.2 KW

Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

-3-A piece of copper as shown in figure is initially at 150 C when suddenly
immersed in an environment at 38 C. Determine the Biot number and find
the piece temperature after 1 minute,
a) if the environment is water with h= 50 W/m2 K
b) if the environment is air with h= 12 W/m2 K
Data: k = 374 W/m K, c, 0.381 kJ/kg K, and p= 8938 kg/m3.
Answ(a- Bi=0.0008913 ; T=136.1C b- Bi=0.0002139 ; T=146.5C).
4 cm
4 cm

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Discuss the modes of heat transfer that determine the equilibrium temperature of the space shuttle Endeavour when it is in orbit. What happens when it reenters the earths atmosphere?
P3. After a particularly cold night, Alice leaves a tub of water outside. You may consider the ground and air to have temperatures of Te = -10°C and Th = 10°C respectively. How thick is the layer of ice that forms at the bottom of the tub of water, after the tub has been left outside for a long time? The tub of water initially has a layer of water of thickness ho 10 cm. You may assume that the ground and air remain at a constant temperature throughout, and that the side lengths of the tub a, b » ho, i.e. the heat conduction is one- dimensional. Density of ice and water are pice = 920 kg/m³ and pw = 1000 kg/m³. Ice and water have thermal conductivities of kice = 2.22 W K-1 m' -1 and kw 0.556 W K-1 m' -1.
Q3) A stainless steel triangular fin (18 percent Cr, 8% Ni) (k-16.3 W/m.ºC) is mounted to a plane wall kept at 460 °C. The fin measures 2.5 cm in length and has a thickness of 6.4 mm. The temperature is 93 degrees Fahrenheit, with a convection heat-transfer coefficient of 28 W/m².°C. Calculate how much heat is lost through the fin.
2-1. Temperature Response in Cooling a Wire. A small copper wire with a diameter of 0.792 mm and initially at 366.5 K is suddenly immersed in a liquid held constant at 311 K. The convection coefficient h 85.2 W/m K. The physical properties can be assumed constant and are k =374 W/m K, c, = 0.389 kJ/kg K, and p = 8890 kg/m2. (a) Determine the time in seconds for the average temperature of the wire to drop to 338.8 K (one-half the initial temperature difference). (b) Do the same but for h 11.36 W/m2 K (c) For part (b), calculate the total amount of heat removed for a wire 1.0 m р u (A long. (a) t 5.66 s Ans. the Smou hire is lons asbume Nhere rraolius , here radlius yinder hitu x Chapter 14 Principles of Unsteady-State Heat Transfer
A large 100-mm thick steel plate is initially at uniform temperature T = 180°C at time t = 0. Both sides of the plate are exposed to 30°C oil with convection coefficient h = 1500 W/m².K. The thermal conductivity, heat capacity, and density of the steel are k = 38 W/m-K, cp = 485 J/kg-K, and p = 7800 kg/m³. a) Find the temperature at the center of the slab when t = 125 s. b) Find the temperature at the surface of the slab when t=125 s.
1.28 Determine the thermal conductivity of steam at 700 K and 1.327 x 10' N/m?. Ans 0.0505 W/m K (klk, = 1.0) 1.29 Delermine the
A plane wall is insulated on its left side (? = 0). The wall generates energy uniformly at arate of ?̇ [W m 3⁄ ] and has thermal conductivity ?. On its right side (? = ?), the wall is exposedto a fluid at temperature ?" with convection coefficient ℎ.a) Draw a schematic of this plane wall. Make the schematic large enough that you cansketch the temperature profile within the wall after solving for it in later steps.b) Write out the full form of the Heat Diffusion Equation (HDE) in the appropriatecoordinate system for this physical scenario. Simplify the HDE and write out theappropriate boundary conditions in their general form (e.g., ?| #$% = ?& ).c) Derive an expression for the steady-state temperature distribution ?(?) within thewall. You may start from the general solution provided in Appendix C of the Bergmantextbook; or you may derive the solution directly from the differential equation andthe boundary conditions. Annotate your schematic by sketching the temperatureprofile…
An AISI stainless steel spherical canister is bath-cooled to store chemicals. The properties of the canister and chemicals are illustrated in the figure below. The inner wall heat flux is qi" = 10 kW/m2. a) Determine the initial rate of change of the canister temperature at the outer wall b) Determine the steady-state inner and outer wall temperatures
As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. "2. Ta2} 1. Ta,1} Steam Insulation (a) If the insulation is 10 mm thick and its inner and outer surfaces are maintained at T, = 800 K and Ta = 490 K. respectively,. what is the rate of heat loss per unit length (q) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (d), in W/m, and outer surface temperature T,2, in K, for the steam pipe with the Inner surface temperature fixed at T = 800 K, inner radius = 0.06 m, and outer radius n = 0.18 m. The outer surface is exposed to an airflow (T 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tur = T, = 25°C. The surface emissivity of calcium silicate is approximately 0.8.
Q: A large plane wall of thickness (L= 0.3 m), thermal conductivity (k = 40 W/m-°C), and surface area 0.4 m2. The left side of the wall is maintained at a constant temperature of 70°C while the right side loses heat to the surrounding air with heat flux q' expressed by: 1200k q = k+20L A- Find a relation to determine the variation of temperature in the wall. B- Determine the rate of heat transfer through the wall. C- Determine the temperature at the right side of the wall. wall T1= 70 °C L= 0.3m
Consider a copper plate that has dimensions of 3 cm x 3 cm x 7 cm (length, width, and thickness, respectively). As shown in the following figure, the copper plate is exposed to a thermal energy source that puts out 126 J every second. The density of copper is 8,900 kg/m³. Assume there is no heat loss to the surrounding block. 126 J Copper Insulation Ⓡ What is the specific heat of copper (in J/(kg K))? J/(kg. K) What is the mass of the copper plate (in kg)? kg How much energy (in J) will be consumed during 11 seconds? J Determine the temperature rise (in K) in the plate after 11 seconds.
There is 100 grams of water in a brass calorimeter of mass 200 grams. It is found that 590 calories are required to raise the temperature of water and container from 20°C to 25°C. What is the specific heat of the brass? COMPLETE FBD SOLUTION AND REQUIREMENTS PS. THIS IS A HEAT TRANSFER PROBLEM