Consider a sphere shaped naphthalene (CH) having a radius of20 mm suspended into a large volume of still air at 50 °C and 1atm absolute pressure. At 50 °C, the vapor pressure ofnaphthalene is 0.9 mm Hg, its density is about 1.1 g/cm³ and itsdiffusivity in air is 7.02 X106 m²/s.(a) Calculate the rate of evaporation of naphthalene into thestill air in kgmol/s.m²(b) Calculate the time for the complete evaporation of thenaphthalene into the still air.

Answer:Part (a): Calculate the Rate of Evaporation of NaphthaleneDetermine the molar mass of…

Answered: Consider a sphere shaped naphthalene…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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a) Consider a pressure of 15.75 kPa for the evaporation of the 50% NaOH solution. Determine the boiling temperature of the NaOH solution, determine the elevation of the boiling point of the solution with respect to the boiling point of water at the same pressure. b) Consider a pressure of 15.75 kPa for the evaporation of the 40% NaOH solution. Determine the boiling temperature of the NaOH solution, determine the elevation of the boiling point of the solution with respect to the boiling point of water at the same pressure. Based on your results, answer the following questions. Do you think what is an important parameter in the design of an evaporator? Why?
In an evaporator, dilute material enters, and concentrated material leaves the system. Water is evaporated during the process. If I am the weight of the dilute material entering the system, W is the weight of water vaporized, and C is the weight of the concentrate, write an equation that represents the total mass balance for the system. Assume that a steady state exists. Show FBD and complete solution.
Heating Air by Condensing Steam. Air is flowing through a tube having an inside di- ameter of 38.1 mm at a velocity of 6.71 m/s, average temperature of 449.9 K, and pres- sure of 138 kPa. The inside wall temperature is held constant at 204.4°C (477.6 steam condensing outside the tube wall. Calculate the heat-transfer coefficient for a long tube and the heat-transfer flux. K) by Ans. h = 39.38 W/m² K (6.94 btu/h. ft².°F)
NEED IT UNTIL 5:15PM Estimate the convective heat-transfer coefficient for natural convection from a horizontalsteam pipe. The outside surface temperature of the insulated pipe is 80°C. Thesurrounding air temperature is 25°C. The outside diameter of the insulated pipe is 10 cm. please help me if my answer is wrong.
28.21 A 1 x 10-2 m spherical pellet is sprayed with a very thin coat of paint. The paint contains a volatile solvent. To dry the pellet, a 300 K and 1.013 × 105 Pa air stream flows around it with a bulk velocity of 1 m/s. The estimated loading of the solvent in the wet paint is 0.12 g solvent/cm³. Physical properties are vapor pressure of the solvent = 1.27 x 104 Pa mass diffusivity of solvent in air = 9.62 x 10-6 m²/s kinematic viscosity of air density of air = 1.569 x 10-5 m²/s = 1.177 kg/m³ thermal conductivity of air thermal diffusivity of air heat capacity of air = 2.624 x 10-2 J/m.s. K = 2.216 x 10-5 m²/s = 1.006 J/g. K = 78 g/g mole molecular weight of the solvent Use the McAdam's¹¹ equation Nu = 0.37(Redp) 0.6 (Pr) 1/3, where Redp dp vx V to evaluate (a) the heat-transfer coefficient, h; (b) the mass-transfer coefficient, ke; (c) the molar flux of the solvent into the air stream.
The results of air temperature measurement obtained a dry bulb temperature of 37 ° C and a wet bulb temperature of 27.5 ° C. Using a psychrometric chart, determine the properties of the air as follows:a. RH:%b. Water content: kg water / kg airc. Specific volume: m3 / kgd. Enthalpy: kJ / kge. Condensation temperature: ° CIf the air is within 162 m3 space, determinef. Air weight (dry air and water vapor): kgg. the amount of water content in the space: kg
A rectifying column consists of a tube arranged vertically and supplied at the bottom with a mixture of benzene and toluene as vapor. At the top, a condenser returns some of the product as a reflux which flows in a thin film down the inner wall of the tube. At one point in the column, the vapor contains 60 mol% benzene and the adjacent liquid reflux contains 51 mol% benzene. The temperature at this point is 92°C. Assuming the diffusional resistance to vapor transfer to be equivalent to the diffusional resistance of a štagnant vapor layer 0.5 mm thick, calculate the rate of interchange of benzene and toluene between vapor and liquid. The molar latent heats of the two materials can be taken as equal. The vapour pressure of toluene at 92°C is 44.0 kN/m2 and the diffusivity of the vapors is 0.053 cm?/s.
The results of air temperature measurement obtained a dry bulb temperature of 29 ° C and a wet bulb temperature of 26.5 ° C. Using a psychometric chart, determine the properties of the air as follows:a. Humidityb. Water contentc. Specific volumed. Enthalpye. Condensation temperatureIf the air is in the space of 162 m3, determine:f. Air weight (dry air and moisture)g. The amount of water content in the room

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