Transient Conduction - Semi-Infinite Solid
Consider an acrylic sheet of thickness L = 5 mm that is used to coat a hot, isothermal metal substrate at Th = 300 C. The properties of acrylicare ρ = 1990 kg / m3, c = 1470 J / kg K , and k = 0.21 W / m K. Neglecting the thermal contact resistance between the acrylic and the metalsubstrate, determine how long it will take for the insulated back of the acrylic to reach its softening tempature, Tsoft = 90 C. The initialacrylic tempature is Ti = 20 C.
answer: 74 s
Homework Answers
Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot...
Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot gas flows when the system is being charged. In the charging process heat is transferred from the hot gas to the spheres and it increases the thermal energy stored in the spheres. Here are some variables that are important - the convection coefficient between the particle surface and the gas is h (W/m2 K) and the particle thermophysical properties are k (W/m K), Cp...
Two-Dimensional Steady and Transient Conduction - Cooling a very large scale microelectronic chip, A simplified representation...
Two-Dimensional Steady and Transient Conduction - Cooling a very
large scale microelectronic chip,
A simplified
representation for cooling in very large-scale integration (VLSI)
of microelectronics is shown in the sketch below. A silicon chip is
mounted in a dielectric substrate, and one surface of the system is
convectively cooled, while the reminding surfaces are well
insulated from the surrounding. The problem is rendered two
dimensional by assuming the system to be very large in the
direction perpendicular to the paper....
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a...
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a temperature of 85 C. On the outside, coolant flows across the tube at a velocity of 3 m/s at a temperature of 25 C. Neglecting the thermal resistance of the metal wall, calculate 1. (a) The two heat transfer coefficients, (b) Overall heat transfer coefficient, and (c) Cooling rate (in W/m) achieved in the given configuration Assume hot fluid properties are constant at the...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value Property 4.506 gcm-3 Density 47.9 g mol-I M Molar mass 8,6 x 10- K- 25.6 21.9 Coefficient of thermal expansion Molar heat capacity Thermal conductivity J mol- K- Wm- K- C k A titanium disc, which has a radius of exactly 10cm and thickness of exactly 5 mm at -20 °C, has a hole of radius exactly 1 cm drilled out of its centre....
summatize the following info and break them into differeng key points. write them in yojr own...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
summarizr the followung info and write them in your own words and break them into different...
summarizr the followung info and write them in your own words and break them into different key points. 6.5 Metering Chamber: 6.5.1 The minimum size of the metering box is governed by the metering area required to obtain a representative test area for the specimen (see 7.2) and for maintenance of reasonable test accuracy. For example, for specimens incorporating air spaces or stud spaces, the metering area shall span an integral number of spaces (see 5.5). The depth of...
Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot gas flows when the system is being charged. In the charging process heat is transferred from the hot gas to the spheres and it increases the thermal energy stored in the spheres. Here are some variables that are important - the convection coefficient between the particle surface and the gas is h (W/m2 K) and the particle thermophysical properties are k (W/m K), Cp...
Two-Dimensional Steady and Transient Conduction - Cooling a very
large scale microelectronic chip,
A simplified
representation for cooling in very large-scale integration (VLSI)
of microelectronics is shown in the sketch below. A silicon chip is
mounted in a dielectric substrate, and one surface of the system is
convectively cooled, while the reminding surfaces are well
insulated from the surrounding. The problem is rendered two
dimensional by assuming the system to be very large in the
direction perpendicular to the paper....
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a temperature of 85 C. On the outside, coolant flows across the tube at a velocity of 3 m/s at a temperature of 25 C. Neglecting the thermal resistance of the metal wall, calculate 1. (a) The two heat transfer coefficients, (b) Overall heat transfer coefficient, and (c) Cooling rate (in W/m) achieved in the given configuration Assume hot fluid properties are constant at the...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value Property 4.506 gcm-3 Density 47.9 g mol-I M Molar mass 8,6 x 10- K- 25.6 21.9 Coefficient of thermal expansion Molar heat capacity Thermal conductivity J mol- K- Wm- K- C k A titanium disc, which has a radius of exactly 10cm and thickness of exactly 5 mm at -20 °C, has a hole of radius exactly 1 cm drilled out of its centre....
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
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