Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
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Chapter 6, Problem 6.52P
On a summer day the air temperature is
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Net radiation at the Laguna Lake is 185 W/m2 at noon on February 14th. Air temperature is 29.5°C, relative humidity is 80%, and wind speed is 1.8 m/s at 2m. – Determine the open water evaporation rate in mm/d using the aerodynamic method, with z0 = 0.03 cm
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Chapter 6 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 6 - The temperature distribution within a laminar...Ch. 6 - In flow over a surface, velocity and temperature...Ch. 6 - In a particular application involving airflow over...Ch. 6 - Water at a temperature of T=25C flows over one of...Ch. 6 - For laminar flow over a flat plate, the local heat...Ch. 6 - A flat plate is of planar dimension 1m0.75m. For...Ch. 6 - Parallel flow of atmospheric air over a flat plate...Ch. 6 - For laminar free convection from a heated vertical...Ch. 6 - A circular. hot gas jet at T is directed normal to...Ch. 6 - Experiments have been conducted to determine local...
Ch. 6 - A concentrating solar collector consists of a...Ch. 6 - Air at a free stream temperature of T=20C is in...Ch. 6 - The heat transfer rate per unit width (normal to...Ch. 6 - Experiments to determine the local convection heat...Ch. 6 - An experimental procedure for validating results...Ch. 6 - If laminar flow is induced at the surface of a...Ch. 6 - Consider the rotating disk of Problem 6.16. A...Ch. 6 - Consider airflow over a flat plate of length L=1m...Ch. 6 - A fan that can provide air speeds up to 50 m/s is...Ch. 6 - Consider the flow conditions of Example 6.4 for...Ch. 6 - Assuming a transition Reynolds number of 5105,...Ch. 6 - To a good approximation, the dynamic viscosity the...Ch. 6 - Prob. 6.23PCh. 6 - Consider a laminar boundary layer developing over...Ch. 6 - Consider a laminar boundary layer developing over...Ch. 6 - Experiments have shown that the transition from...Ch. 6 - An object of irregular shape has a characteristic...Ch. 6 - Experiments have shown that, for airflow at T=35C...Ch. 6 - Experimental measurements of the convection heat...Ch. 6 - To assess the efficacy of different liquids for...Ch. 6 - Gases are often used instead of liquids to cool...Ch. 6 - Experimental results for heat transfer over a flat...Ch. 6 - Consider conditions for which a fluid with a free...Ch. 6 - Consider the nanofluid of Example 2.2. Calculate...Ch. 6 - For flow over a flat plate of length L, the local...Ch. 6 - For laminar boundary layer flow over a flat plate...Ch. 6 - Sketch the variation of the velocity and thermal...Ch. 6 - Consider parallel flow over a flat plate for air...Ch. 6 - Forced air at T=25C and V=10m/s is used to cool...Ch. 6 - Consider the electronic elements that are cooled...Ch. 6 - Consider the chip on the circuit board of Problem...Ch. 6 - A major contributor to product defects in...Ch. 6 - A microscale detector monitors a steady flow...Ch. 6 - A thin, flat plate that is 0.2m0.2m on a side is...Ch. 6 - Atmospheric air is in parallel flow...Ch. 6 - Determine the drag force imparted to the top...Ch. 6 - For flow over a flat plate with an extremely rough...Ch. 6 - A thin, flat plate that is 0.2m0.2m on a side with...Ch. 6 - As a means of preventing ice formation on the...Ch. 6 - A circuit board with a dense distribution of...Ch. 6 - On a summer day the air temperature is 27C and the...Ch. 6 - It is observed that a 230-mm-diameter pan of water...Ch. 6 - The rate at which water is lost because of...Ch. 6 - Photosynthesis, as it occurs in the leaves of a...Ch. 6 - Species A is evaporating from a flat surface into...Ch. 6 - Prob. 6.57PCh. 6 - Prob. 6.58PCh. 6 - An object of irregular shape has a characteristic...Ch. 6 - Prob. 6.60PCh. 6 - An object of irregular shape 1 m long maintained...Ch. 6 - Prob. 6.62PCh. 6 - Prob. 6.63PCh. 6 - Prob. 6.64PCh. 6 - Prob. 6.65PCh. 6 - A streamlined strut supporting a bearing housing...Ch. 6 - Prob. 6.67PCh. 6 - Consider the conditions of Problem 6.7, for which...Ch. 6 - Using the naphthalene sublimation technique. the...Ch. 6 - Prob. 6.70PCh. 6 - Prob. 6.71PCh. 6 - Prob. 6.72PCh. 6 - Dry air at 32C flows over a wetted (water) plate...Ch. 6 - Dry air at 32C flows over a wetted plate of length...Ch. 6 - Prob. 6.75PCh. 6 - Prob. 6.76PCh. 6 - Prob. 6.77PCh. 6 - An expression for the actual water vapor partial...Ch. 6 - A mist cooler is used to provide relief for a...Ch. 6 - A wet-bulb thermometer consists of a...Ch. 6 - Prob. 6.81PCh. 6 - Prob. 6.83PCh. 6 - An experiment is conducted to determine the...Ch. 6 - Prob. 6.85PCh. 6 - Consider the control volume shown for the special...Ch. 6 - Prob. 6S.2PCh. 6 - Prob. 6S.3PCh. 6 - Consider two large (infinite) parallel plates, 5...Ch. 6 - Prob. 6S.5PCh. 6 - Consider Couette flow for which the moving plate...Ch. 6 - A shaft with a diameter of 100 mm rotates at 9000...Ch. 6 - Consider the problem of steady, incompressible...Ch. 6 - Prob. 6S.11PCh. 6 - A simple scheme for desalination involves...Ch. 6 - Consider the conservation equations (6S.24) and...
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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
- ● Air at 40 oC and 1 atm flows over a 5 m long wet plate with an average velocity of 2 m/s to dry the surface. Using analogy between heat and mass transfer. Determine the mass transfer coefficient on the plate. • Extra information: at 40 oC and 1 atm, v= 1.702 *10-5 T2.072 DAB 1.87 x 10-5 x Parrow_forwardHumid air at constant 101 kPa pressure, 30°C temperature and 40% relative humidity undergoes an isobaric cooling process unitl its temperature reaches 22°C. Calculate how much energy by heat is transferred from the air stream in kJ per kg of dry air. Give you answer to two significant figures and enter the numerical value only (@.g. 0.0123, 0.123, 123, 1230, but not 0.0123 kJ/kgDA).arrow_forward• Problem 1 • Air at 40 oC and 1 atm flows over a 5 m long wet plate with an average velocity of 2 m/s to dry the surface. Using analogy between heat and mass transfer. Determine the mass transfer coefficient on the plate. • Extra information: at 40 oC and 1 atm, v= 1.702 *10-5 T2.072 • DAB 1.87 x 10-5 X Parrow_forward
- Humid air at constant 101 kPa pressure, 30°C temperature and 40% relative humidity undergoes an isobaric cooling process unitl its temperature reaches 22°C. Calculate how much energy by heat is transferred from the air stream in kJ per kg of dry air. Give you answer to two significant figures and enter the numerical value only (eg. 0.0123, 0.123., 123, 1230, but not 0.0123 kJ/KGDA). 3arrow_forwardFrom an open water surface with air temperature 22°C, relative humidity is 40% and wind speed is 3 m/s, all measured at height 2 m above the water surface. Assume a roughness height of 0.03 cm. The net radiation is 200 W/m^2. Cp = 1005 J/kg-K A. Calculate the latent heat of vaporization (J/kg) B. Calculate the evaporation using Energy Balance Method (mm/day) C. Calculate the saturation deficit of the vapor pressure (Pa) D. Calculate the evaporation using Priestley-Taylor Method (mm/day)arrow_forwardProper indoor ventilation is important to lower the risk of infection from the SARS-CoV-2 virus. The air in a room (28.0°C and 30% humidity) with a volume of 96.6 m3 must be replaced every 5 minutes. Outside air at 38.0°C and 70% humidity is chilled to remove some of its water content and then dehumidified to the required temperature. What is the volumetric flow rate (in m3/min) of the humid air entering the chiller? How many kg of water per kg of dry air is removed from the dehumidification process? To what temperature (in °C) should the outside air be chilled?arrow_forward
- can u explain and be fast pleasearrow_forwardWater vapor is evaporated into the air at T = 25°C and P = 1 atm in a 10m x 100m water pool The distance between the surface of water and air outside of the container is 20 cm (Z2 - Z₁ 20cm) the humidity at Z₁ is XA1 = 2% and that at Z2 is XA2 = 1.9%. The diffusivity of water vapor to air at T = 25°C is DAB 0.282 cm²/s. Universal gas constant R = 0.00008205 .m³atm mol.K = NE Estimate the rate of water vapor (kg/day) evaporated at the surface of the water at z = Z1 |z2 Molar mass of water M = z1 18 g/molarrow_forwardA vertical plate 30 cm wide by 30 cm is maintained at 98 °C and exposed to saturated steam at 1 atm. Calculate the rate of heat transfer and the total mass of steam condensed per hour.arrow_forward
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