1.4)True/False: The heat flux in a circular tube with laminar forced convectionwill be higher near the inlet of the tube and gradually decreases to the fullydeveloped value.1.5) Fill in the blanks: A body whose surface properties are independent ofThe emissivity of aiswavelength is said to be aone for all wavelengths, the emissivity of ais between zero andone.1.6) Fill in the blanks: The thermal resistance of the tube in a heat exchanger isand theusually negligible when the wall thickness of the tube isthermal conductivity of the tube material is1.7) True/False: The heat transfer in a heat exchanger will reach its maximumvalue when the cold fluid is heated to the inlet temperature of the hot fluid.Therefore, the temperature of the cold fluid cannot rise above the inlettemperature of the hot fluid at any location in a heat exchanger.

1.4) True 1.5)graybody, blackbody, graybody 1.6) small, high 1.7) True The reasons are given below.

1.4) True/False: The heat flux in a circular tube with laminar forced convection will be higher near the inlet of the tube and gradually decreases to the fully developed value. 1.5) Fill in the blanks: A body whose surface properties are independent of is wavelength is said to be a one for all wavelengths, the emissivity of a The emissivity of a is between zero and one. 1.6) Fill in the blanks: The thermal resistance of the tube in a heat exchanger is usually negligible when the wall thickness of the tube is thermal conductivity of the tube material is and the 1.7) True/False: The heat transfer in a heat exchanger will reach its maximum value when the cold fluid is heated to the inlet temperature of the hot fluid. Therefore, the temperature of the cold fluid cannot rise above the inlet temperature of the hot fluid at any location in a heat exchanger.

1.4) True/False: The heat flux in a circular tube with laminar forced convection will be higher near the inlet of the tube and gradually decreases to the fully developed value. 1.5) Fill in the blanks: A body whose surface properties are independent of is wavelength is said to be a one for all wavelengths, the emissivity of a The emissivity of a is between zero and one. 1.6) Fill in the blanks: The thermal resistance of the tube in a heat exchanger is usually negligible when the wall thickness of the tube is thermal conductivity of the tube material is and the 1.7) True/False: The heat transfer in a heat exchanger will reach its maximum value when the cold fluid is heated to the inlet temperature of the hot fluid. Therefore, the temperature of the cold fluid cannot rise above the inlet temperature of the hot fluid at any location in a heat exchanger.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

MATLAB PROBLEM
Consider steady heat transfer between two large parallel plates at constant temperatures T1 = 300 K and T2 = 200 K that are L = 1 cm apart, as shown below. Assuming the surface to be black, determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is a) filled with still air with k = 0.0219 W/m°C, b) free flowing air with h = 7.5 W/m2°C, c) evacuated, d) filled with urethane insulation with k = 0.026 W/m°C, and e) filled with superinsulation that has an apparent thermal conductivity k = 0.00002 W/m°C PLEASE ANSWER LETTER D AND E, THANK YOU
Do You will eat the fruits of your labor: blessings and prosperity will be yours, Psalm 128:2 Grades will depend on details and completeness of: Schematic and given 2. Assumptions 3. Analysis 1. 0.5 1. (5 points) A surface of area 0.5 m², emissivity 0.8, and temperature 150 C is placed in a large evacuated chamber whose walls are maintained at 25 C. What is the net rate of heat transfer between the surface and the chamber walls? Assumptions Steady State, operating confitions Include Pu equatun hin subs ti tah 150-25 (0.8)(0 5) o 01 = - 224
PROBLEM 4: A black thermocouple is inside a chamber with black walls. If the air around the thermocouple is at 20°C, the walls are at 100-C, and the heat transfer coefficient between the thermocouple and the air is 75 W/m²K, what temperature will the thermocouple read?
A plate that is exposed to the outside environment at 30 ° C, gets airradiation of 2000 W / m2. The plate, which absorbs 80% of the irradiationand it has an emissivity of 0.5, it is always at a uniform temperature.An external air flow at 20 ° C and 15 W / m2-K go through the plate. Calculatethe temperature of the plate if it is in thermal equilibrium and insteady state conditions.
i need correct explanation my best wishes ton
A long, horizontal, cylindrical steel reactor, 1 m in diameter, has a surface temperature of 300ºC. The emissivity of the steel is 0.6, and the heat transfer coefficient for natural convection is 5 W m−2 K−1 . Heat is lost by convection to the air at 15ºC, and also by radiation to the surroundings, which can be considered to be a black body at 15ºC. a) Calculate the total heat loss per metre length of the reactor, and the proportions lost by convection and radiation b) The reactor is then insulated with a thin layer of insulation material to reduce the total heat loss to one-tenth of its original value. This causes the surface temperature of the steel to rise to 400ºC. The thermal conductivity of the insulation is 0.01 W m−1 K−1 , and its surface emissivity is 0.2. Show that the resulting surface temperature of the insulation is about 89ºC, and calculate the thickness of insulation required, stating any assumptions made. Specifically need help with part b
2. A heater is a thin vertical panel 1.0m long and 0.7m high and is used in a warehouse to keep workers warm. The heater has air circulating on each side. Assume the maximum temperature of the panel is 60°C (already above the board line that is safe for human hands to touch briefly without getting hurt). Assume the room air temperature is 18°C but the warehouse wall temperature is 5°C. Model the surface with an emittance of 0.9 and Vair = 1.57x105 m²/s. a. Determine the maximum power rating for the heater. b. Now if you run the heat by standing on its side (it will be 1.0 m high and 0.7 m long), determine the surface temperature. c. Compare case a and b and explain any differences you see.
After sunset, radiant energy can be sensed by a person standing near a brick wall, such walls frequently have surface temperatures around 44°C, and typical brick emissivity values are on the order of 0.92. What would be the radiant thermal flux per square foot from a brick wall at this temperature?
I need the answer as soon as possible
In Gaziantep, many people use the energy of the Sun for heating their domestic water used for having shower in bathroom, for washing-machines, for kitchen stuffs, and etc. An ordinary solar collector panel is generally constructed on the roof of a house and the panels are declined approximately 60° with the horizontal line. Commonly, the total surface area of two glass panels is approximately 4.0 m² (2 panels: 1980mm x 1000mm for each) and they receive the energy from the Sun to heat the water. Although there is an inclination by 60°, it is reported that the twenty percent of the total incoming energy is reflected back to the atmosphere by well-insulated panel's glass surface. The remaining energy is used to heat the domestic water from 20°C to 50°C, and it is stored in storage tanks in a sunny day. The cold water enters from the bottom side of panel and exits from the top. It is assumed that the water passing through the solar collector has a negligible pressure drop. If the volume…
i need clear ans by hand and solve very very fast in 20 min and thank you | ᴅʏʙᴀʟᴀ ?✨؛