Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 8, Problem 8.128P
Dry air is inhaled at a rate of lo liter/win through a trachea with a diameter of
normal body temperature of
(a) Assuming steady, fully developed flow in the trachea, estimate the
(b) Estimate the daily water loss (liter/day) associated with evaporation in the trachea.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Estimate the mass-transfer coefficient for moist air flowing normal to a 25 mm diameter tube (Nu = 0.615 Re0.47). The air velocity is 0.5 m/s. Assume standard air.
B- A continuous separating tank is to be designed to follow after a water washing plant for
liquid oil. Estimate the necessary area for the tank if the oil, on leaving the washer is in the
form of small spherical particles 5.1 * 105 m diameter, the feed concentration is 4 Kg water to
1 Kg oil, and the leaving water is effectively oil free.
The mass rate of feed of solids is 200 Kg/h. Viscosity of water = 0.7*10³ N.s/m².
Density of water = 1000 Kg/m³. Pol 894kg/m²
Consider pressurized water, engine oil (unused), and Nak (22%/78%) flowing in a 20-mm-diameter tube.
(a) Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids
when the fluid temperature is 366 K and the flow rate is 0.01 kg/s.
(b) Determine the mass flow rate, in kg/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for water and engine
oil at 300 and 400 K and a mean velocity of 0.022 m/s.
Part A
Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids
when the fluid temperature is 366K and the flow rate is 0.01 kg/s.
Liquid
Um (m/s)
Xfdh (m)
Xfd,t (m)
water
i
engine oil
i
i
i
Nak
i
Chapter 8 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 8 - Fully developed conditions are known to exist for...Ch. 8 - What is the pressure drop associated with water at...Ch. 8 - Water at 27C flows with a mean velocity of 1 m/s...Ch. 8 - An engine oil cooler consists of a bundle of 25...Ch. 8 - For fully developed laminar flow through a...Ch. 8 - Consider pressurized water, engine oil (unused),...Ch. 8 - Velocity and temperature profiles for laminar flow...Ch. 8 - At a particular axial station, velocity and...Ch. 8 - In Chapter 1, it was stated that for...Ch. 8 - When viscous dissipation is included. Equation...
Ch. 8 - Consider a circular tube of diameter D and length...Ch. 8 - Consider flow in a circular tube. Within the test...Ch. 8 - Consider a cylindrical nuclear fuel rod of length...Ch. 8 - Consider the laminar thermal boundary layer...Ch. 8 - In a particular application involving fluid flow...Ch. 8 - A flat-plate solar collector is used w heat...Ch. 8 - Atmospheric air enters the heated section of a...Ch. 8 - Fluid enters a tube with a flow rate of 0.015kg/s...Ch. 8 - Water at 300 K and a flow rate of 5kg/s enters a...Ch. 8 - Slug flow is an idealized tube flow condition for...Ch. 8 - Superimposing a control volume that is...Ch. 8 - An experimental nuclear core simulation apparatus...Ch. 8 - Water at 20°C and a flow rate of 0.1kg/s enters a...Ch. 8 - Engine oil is heated by flowing through a circular...Ch. 8 - Engine oil flows through a 25mm -diameter tube at...Ch. 8 - In the final stages of production, a...Ch. 8 - An oil preheater consists of a single tube of 10mm...Ch. 8 - Engine oil flows at a rate of 1kg/s through a 5mm...Ch. 8 - Air at p=1atm enters a thin-walled ( D=5-mm...Ch. 8 - To cool a summer home without using a vapor...Ch. 8 - Batch processes are often used in chemical and...Ch. 8 - The evaporator section of a heat pump is installed...Ch. 8 - Water flowing at 2kg/s through a 40mm diameter...Ch. 8 - Consider the conditions associated with the hot...Ch. 8 - A thick-walled, stainless steel (AISI 316) pipe of...Ch. 8 - An air heater for an industrial application...Ch. 8 - Consider fully developed conditions in a circular...Ch. 8 - Consider the encased pipe of Problem 4.29, but now...Ch. 8 - Water flows through a thick-wailed tube with an...Ch. 8 - Atmospheric air enters a 10m -long. 150mm...Ch. 8 - NaK (45%/55). which is an alloy of sodium and...Ch. 8 - The products of combustion from a burner are...Ch. 8 - Liquid mercury at 0.5kg/s is lo be heated from 300...Ch. 8 - The surface of a 50-mm-diameter. thin-walled tube...Ch. 8 - Consider a horizontal, thin-walled circular tube...Ch. 8 - Consider pressurized liquid water flowing at...Ch. 8 - Cooling water flows through the 25.4-mm -diameter...Ch. 8 - The air passage for cooling a gas turbine vane can...Ch. 8 - The core of a high-temperature, gas-cooled nuclear...Ch. 8 - Air at 200kPa enters a 2-m -long, thin-walled tube...Ch. 8 - Heated air required for a food-drying process is...Ch. 8 - Consider laminar flow of a fluid with Pr=4 that...Ch. 8 - A common procedure for cooling a high-performance...Ch. 8 - One way to cool chips mounted on the circuit...Ch. 8 - Refrigerant- 134a is being transported a 0.1 kg/s...Ch. 8 - Oil at 150°C flows slowly through a long,...Ch. 8 - Exhaust gases from a wire processing oven are...Ch. 8 - A hot fluid passes through a thin-walled tube of...Ch. 8 - Consider a thin-walled tube of 10mm diameter and...Ch. 8 - Water at a flow rate of m =0.215kg/s is cooled...Ch. 8 - To maintain pump power requirements per unit flow...Ch. 8 - Consider a thin-walled, metallic tube of length...Ch. 8 - A circular tube of diameter D=0.2mm and length...Ch. 8 - Repeat Problem 8.66 for a circular tube of...Ch. 8 - Heat is to be removed from a reaction vessel...Ch. 8 - A healing contractor must heat 0.2kg/s of water...Ch. 8 - A thin-walled tube with a diameter of 6 mm and...Ch. 8 - A 50mm -diameter, thin—walled metal pipe covered...Ch. 8 - A thin-walled, uninsulated 0.3m -diameter duct is...Ch. 8 - Pressurized water at Tm,i=200C is pumped at...Ch. 8 - Water at 290K and 0.2kg/s flows through a Teflon...Ch. 8 - The temperature of flue gases flowing through the...Ch. 8 - In a biomedical supplies manufacturing process, a...Ch. 8 - Consider the ground source heat pump of Problem...Ch. 8 - For a sharp-edged inlet and a combined entry...Ch. 8 - Fluid enters a thin-walled rube of 5-mni diameter...Ch. 8 - Air at 3104kg/s and 27C enters a rectangular duct...Ch. 8 - Air at 25C flows at 30106kg/s within 100mm -long...Ch. 8 - A cold plate is an active cooling device that is...Ch. 8 - The cold plate design of Problem 8.82 has not been...Ch. 8 - A device that recovers heat from high-temperature...Ch. 8 - Air at 1 atm and 285K enters a 2-m -long...Ch. 8 - A double-wall heat exchanger is used to transfer...Ch. 8 - Consider laminar, fully developed flow in a...Ch. 8 - You have been asked to perform a feasibility study...Ch. 8 - A coolant flows through a rectangular channel...Ch. 8 - An electronic circuit board dissipating 50W is...Ch. 8 - To slow down large prime movers like locomotives,...Ch. 8 - A printed circuit board (PCB) is cooled by...Ch. 8 - Water at m=0.02kg/s and Tm,i=20C enters an annular...Ch. 8 - tFor the conditions of Problem 8.93, how tong must...Ch. 8 - Referring 10 Figure 8.11, consider conditions in...Ch. 8 - Consider the air healer of Problem 8.38, but now...Ch. 8 - Consider a concentric tube annulus for which the...Ch. 8 - It is common practice (o recover waste heat from...Ch. 8 - A concentric lube arrangement, for which the inner...Ch. 8 - Consider sterilization of the pharmaceutical...Ch. 8 - An engineer proposes to insert a solid rod of...Ch. 8 - An electrical power transformer of diameter 230mm...Ch. 8 - A bayonet cooler is used to reduce the temperature...Ch. 8 - The mold used in an injection molding process...Ch. 8 - Prob. 8.107PCh. 8 - Prob. 8.108PCh. 8 - Consider the microchannel cooling arrangement...Ch. 8 - The onset of turbulence in a gas flowing within a...Ch. 8 - Due to its comparatively large thermal...Ch. 8 - A novel scheme for dissipating heat from the chips...Ch. 8 - An experiment is designed to study microscale...Ch. 8 - Determine the tube diameter that corresponds to a...Ch. 8 - An experiment is devised to measure liquid flow...Ch. 8 - In the processing of very long plastic tubes of...Ch. 8 - Air at 300K and a flow rate of 3kg/h passes upward...Ch. 8 - What is the convection mass transfer coefficient...Ch. 8 - Air flowing through a tube of 75mm diameter passes...Ch. 8 - Consider gas flow of mass density and rate m...Ch. 8 - Atmospheric air at 25C and 3104kg/s flows through...Ch. 8 - Air at 25C and 1atm is in fully developed flow at...Ch. 8 - A humidifier consists of a bundle of vertical...Ch. 8 - The final step of a manufacturing process in which...Ch. 8 - Dry air is inhaled at a rate of lo liter/win...Ch. 8 - A mass transfer Operation is preceded by laminar...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
What is the importance of modeling in engineering? How are the mathematical models for engineering processes pr...
Heat and Mass Transfer: Fundamentals and Applications
What types of polymers are most commonly blow molded?
DeGarmo's Materials and Processes in Manufacturing
Determine the length of the cantilevered beam so that the maximum bending stress in the beam is equivalent to t...
Mechanics of Materials (10th Edition)
23.23 A highly oxidized and uneven round bar is being turned on a lathe. Would you recommend a small or a large...
Manufacturing Engineering & Technology
17–1C A high-speed aircraft is cruising in still air. How does the temperature of air at the nose of the aircra...
Thermodynamics: An Engineering Approach
Determine the velocity of block D if end A of the rope is pulled down with a speed of vA = 3 m/s.
Engineering Mechanics: Dynamics (14th Edition)
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
- Only handwritten or I'll dislike sure handwrittenarrow_forwardWhat is the Reynolds number of a fluid flowing in a tube with an inside diameter of 1 inches? The viscocity is 1.353 x 10^ -5 lb/ft-s and the mass flow rate is 79 lb/h.Correct Answer: 24,780.96 ± 1%arrow_forwardNot Ai generated answers, I need to understand please show all steps.arrow_forward
- Air at 0.8 atm enters at 18 C. Flows across bank of tubes 13 rows high and 7 rows deep at velocity of 9 m/s .The surfaces of tubes are maintained at 78 . The length of tubes is 1.2 m and the diameter of 1.5 cm .They are arranged in staggered manner so that the spacing in both the vertical and horizontal direction are 3cm and 2.25cm respectively. Calculate the total heat transfer and the exit air temperature.arrow_forward10A.5. Free convection velocity. (a) Verify the expression for the average velocity in the upward-moving stream in Eq. 10.9-16. (b) Evaluate 3 for the conditions given below. (c) What is the average velocity in the upward-moving stream in the system described in Fig. 10.9-1 for air flowing under these conditions? Pressure Temperature of the heated wall Temperature of the cooled wall Spacing between the walls Answer: 2.3 cm/s T3=0°F. Wall 1 atm 100°C 20°C 0.6 cm -T₂ = 61°F Surface temperatures -T₁ = 69°F of plastic panel Plastic panel has thermal conductivity k = 0.075 Btu/hr. ft. °F (average value between T₁ and T₂) -0.502" Fig. 10A.6. Determination of the thermal resistance of a wall. Problems 321arrow_forwardCorsidera circular smoth pipeof inner diameter D;=0.015mwhose inner surface is covered with a layer of liquid as a result of condensation. In order to dry the inner surface of the pipe, air at 300K at 1 atmis forced to flow throughit with anaverage velocity of 1.2m/s. Using the analogy between heat and mass trarsfer, detemine the mass transfer coeffícient irside the pipe for fully developed flow. Note: Viscosity of the air for given conditions is given as 1.58 x 10°n?/s. Also, for a lamirar fully developed flow the N=Sh=3.66. Your solution must state governing equations and associated assumptions, illustration and step by step execution of the overall solutionarrow_forward
- In an absorption tower, ammonia is absorbed from air at atmospheric pressure by aceticacid. The flowrate of 2 kg/m2s in a test corresponds to a Reynolds number of 5100 andhence a friction factor R/ρu2 of 0.020. At the temperature of absorption the viscosity ofthe gas stream is 0.018 mNs/m2, the density is 1.154 kg/m3 and the diffusion coefficientof ammonia in air is 1.96 × 10−5 m2/s. Determine the mass transfer coefficient throughthe gas film in kg/m2s (kN/m2) Explain briefly .arrow_forwardQ6/ It is required to enhance the wear resistance of steel part by Nitriding process. To perform such task, the nitrogen surface concentration must be increased to 0.5 wt% while the initial value was 0.002 wt%. The nitrogen gas with constant temperature is provided from external source. To optimize the diffusion process; the subsurface layer of 0.4 mm depth, must has nitrogen content of 0.1 wt%. Find out the required process temperature to accomplish this treatment at 1.6 hour. The values of activation energy and preexponential for the nitrogen in iron at this temperature are 76,150 J/mol and 3 x 107 m2/s, respectively. erf(z) erf(z) erf(z) 0.55 0.5633 1.3 0.9340 0.025 0.0282 0.60 0.6039 1.4 0.9523 0.05 0.0564 0.65 0.6420 1.5 0.9661 0.10 0.1125 0.70 0.6778 1.6 0.9763 0.15 0.1680 0.75 0.7112 1.7 0.9838 0.20 0.2227 0.80 0.7421 1.8 0.9891 0.25 0.2763 0.85 0.7707 1.9 0.9928 0.30 0.3286 0.90 0.7970 2.0 0.9953 0.35 0.3794 0.95 0.8209 2.2 0.9981 0.40 0.4284 1.0 0.8427 2.4 0.9993 0.45 0.4755…arrow_forwardChoose the right answer 1. The mean Nusselt number for fully developed laminar flow in a circular tube under a constant heat flux a. depends on Reynolds number b. depends on Prandtl number c. is constant 2. The value of Prandtl number for air is about а. 0.1 b. О.3 с. 0.7 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Grand Pr 4. A fluid is flowing along a plate having a high uniform wall temperature. The heat transfer along the length a. decreases b. remain constant c. increases 5. For fully developed laminar flow and heat transfer in a heated long circular tube, if the flow velocity is doubled and the tube diameter is halved, the heat transfer coefficient will be a. four times of the original value before b. half of the original value C. same as d. double of the original valuearrow_forward
- Choose the right answer 1. The mean Nusselt number for fully developed laminar flow in a circular tube under a constant heat flux a. depends on Reynolds number b. depends on Prandtl number c. is constant 2. The value of Prandtl number for air is about а. О.1 b. 0.3 с. 0.7 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Grand Pr 4. A fluid is flowing along a plate having a high uniform wall temperature. The heat transfer along the length a. decreases b. remain constant c. increases 5. For fully developed laminar flow and heat transfer in a heated long circular tube, if the flow velocity is doubled and the tube diameter is halved, the heat transfer coefficient will be a. four times of the original value before b. half of the original value с. same as d. double of the original valuearrow_forwardA forced-draft countercurrent water-cooling tower is to cool water from 43.3 to 26.7 degC. The air enters at the bottom of the tower at 23.9 degC with a wet bulb temperature of 21.1 degC. The value of Hg for the flow conditions is Hg=0.533 m. The heat-transfer resistance in the liquid phase will be neglected.(a) What is the effectiveness of the tower?(b) Calculate the minimum air rate that can be used.(c) Calculate the tower height if 1.5 times the minimum air rate is used.arrow_forwardCurrent Attempt in Progress Consider pressurized water, engine oil (unused), and Nak (22 %/78%) flowing in a 20-mm-diameter tube. (a) Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366 K and the flow rate is 0.014 kg/s. (b) Determine the mass flow rate, in kg/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for water and engine oil at 300 and 400 K and a mean velocity of 0.018 m/s. Part A Your answer is incorrect. Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366 K and the flow rate is 0.014 kg/s. Liquid water engine oil Nak (m/s) ! i XALA(M) xer (m) Attempts: unlimited Submit Answerarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license