Fundamentals Of Momentum Heat And Mass Transfer 7th Edition James Welty, Gregory L. Rorrer, David G. Foster - Solutions

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Natural gas from a hydraulic fracturing process contains hydrogen sulfide (H2S) gas that will be removed by absorption into a specialty solvent through an interphase mass transfer process. In the present process, the gas contains 6.0 mole% H2S and the liquid solvent contains 2.0 mole% H2S. The
Pipes often contain solid residue that adheres to the inner wall of the pipe. If these pipes are not properly cleaned before use, then the flow of water through the pipe will slowly dissolve the contaminant solid (solute A) into the water through a convective mass transfer process. Consider the
The photocatalytic tubular reactor shown in the figure (next page) is used to decompose organic contaminants in liquid waste water. The inter walls of the 1.5 cm inner diameter glass tube are lined with a thin, nonporous, transparent layer of nanocrystalline titanium dioxide (TiO2), which catalyzes
In a wastewater treatment process, we are concerned about the possible release of the aromatic hydrocarbon benzene to the atmosphere. In the present process, 3.0 gmole/m3 of benzene (solute A, mol. weight 78 g/gmole, C6H6) dissolved in water is exposed to air which contains no benzene vapor in the
As society searches for technical solutions to global warming, vast ponds of photosynthetic algae are seen as one possible solution for the removal of CO2 from combustion of fossil fuels. Consider the process shown in the figure (next page), where a flue gas containing a binary mixture 10 mole%
The well-mixed bubbler tank shown in the figure below is used to prepare carbonated water needed for the production of soft drinks. The tank volume is 2.0 m3, and the tank diameter is 1.0 m. The process operates at steady state. Pure water containing no CO2 is continuously added to the tank, and
Consider the remediation trench shown in the figure below, a simple process to treat contaminated wastewater before discharge to a lake or river. The remediation trench consists of a narrow outdoor open channel with an air sparger aligned along the bottom of the trench. Wastewater containing a
An open pond containing 200 m3 of wastewater is contaminated with a small concentration of trichloroethylene (TCE), a common industrial solvent. The pond is 2.0 meters deep and 10 meters on a side. Air is sparged into the bottom of the trench to “strip out” the dissolved TCE. The inlet air flow
The convective mass-transfer device shown in the figure (right column) is used to generate a gas stream containing a mixture of phosphorous oxychloride (POCl3) vapor diluted in inert helium (He) gas. This gas mixture is sent to a diffusion furnace to serve as the primary dopant for the manufacture
Wilke and Hougan studied the mass-transfer characteristics of packed beds containing granular solids. In their experimental investigations, hot air was blown through a packed bed of porous celite pellets saturated with liquid water. The water evaporated under adiabatic conditions, and the rate of
Tetraethoxysilane, also called TEOS or Si(OC2H5)4, is a liquid chemical used in the semiconductor industry to produce thin films of silicon dioxide by chemical vapor deposition (CVD). In order to deliver the TEOS vapor to the CVD reactor, liquid TEOS is fed to a wetted-wall column. The TEOS liquid
A process is being developed to produce carbonated beverages. As part of this process, a wetted-wall absorption column 2.0 m long will be used to dissolve carbon dioxide (CO2) gas into water. The process is shown in the figure (next page). In this process, pure mountain spring water containing no
The “soil venting” shown in the figure (next page) is used to treat soil contaminated with volatile, toxic liquids. In the present situation, the porous soil particles are saturated with liquid TCE, a common industrial solvent. The contaminated soil is dug up at the waste site and loaded into a
A “rotating disk” shown in the figure (at right) is used to plate a thin film of copper onto a silicon wafer by an electroless plating process at 25 C. The disk is 8.0 cm in diameter and rotates at a speed of 2.0 rev/s. The plating bath liquid volume is 500 cm3. In the electroless plating
A process is being developed to produce carbonated beverages. As part of this process, a packed-bed absorption tower will be used to dissolve carbon dioxide, CO2, gas into water. Pure mountain spring water, containing no dissolved CO2 enters the top of the column at a molar flow rate of 5.0
A “bubbleless” shell-and-tube membrane aeration system is used to transfer oxygen gas (O2) to liquid water. Water containing no dissolved oxygen is added to the tube side at the entrance at a bulk velocity of 5.0 cm/s. The inner diameter of the tube is 1.0 cm, and the tube wall thickness is 2.0
Consider the concentric tubular mass transfer device shown in the figure below. This device is designed to gradually introduce hydrogen (H2) gas (species A) into a pure oxygen gas (O2) inlet stream (species B) delivered to the shell side of the process. Pure H2 gas enters the tube side of the
A counter-current packed tower will be used to remove H2S vapor from a N2-rich gas stream. In the present process, the inlet gas stream entering the bottom of the tower contains 5.0 mole% H2S at a superficial molar flowrate of 10 kgmole/m2/h, and the processed gas stream exiting the top of the
A countercurrent gas absorption tower packed with 1.5 in ceramic Intalox saddles is used to process 360 kgmole/h of an inlet gas stream containing 10 mole% sulfur dioxide (SO2) in nitrogen (N2) gas. The process is temperature is 32 C, and the total system pressure is 1.5 atm. Since SO2 is not very
Develop a model equation, in final, integrated algebraic form, to determine the total transfer rate of ethylene WA, units mole A/time, product of flux and surface area) into the cylindrical catalyst pellet. The model equation should include terms for the diffusion coefficient (D Ae), the dimensions
Rework Problem 20.36 for a staggered arrangement.Data From Problem 20.36A tube bank employs an in-line arrangement with ST = SL = 3.2 cm and tubes that are 1.8 cm in outside diameter. There are 10 rows of tubes, which are held at a surface temperature of 85 C. Air at atmospheric pressure and 20 C
The molecular diffusion coefficient of methanol dissolved in liquid water as the solvent is 1.28 X 10-5 cm2/s at 15 C and 1.0 atm total system pressure. What is the molecular diffusion coefficient for methanol dissolved in liquid water at 30 C? Potentially useful data: for methanol (A), liquid
Consider that a binary mixture of 5.0 mole% ethanol vapor in 95 mole% carbon dioxide carrier gas is diffusing through a randomly porous adsorbent material with void fraction of 0.50. The system temperature is 80 C, and the total system pressure is 1.5 atm. It is known that at 80 C and 1.0 atm, the
A pipeline containing natural gas from a hydraulic fracturing process contains 80% methane gas (CH4, species A) and 20% ethane (C2H6, species B) gas at 3.0 atm and 17 C, as shown in figure below. We are concerned that if the pipeline leaks, then the gas mixture can transfer through the porous layer
Consider a system for mass transfer of a binary mixture of species A and B within the control volume shown in the figure below. The concentration at the surface (cAs) is constant, the process is very dilute with respect to species A within the control volume, the control volume fluid is still (not
The elements arsenic and phosphorus are common dopants in crystalline silicon that impart semiconductor properties to it via the introduction of p-type carriers into the silicon lattice. The doping process is carried out by a solid-state diffusion process at high temperature.a. Compare the
Consider the cylindrical porous pellet shown in the figure below. A gas mixture of species A and B continually flows over the top face of the pellet. The sides and bottom of the pellet are sealed, and so serve as an impermeable barrier. Within the porous layer, species A forms species B by A B,
Consider the hollow cylinder for drug delivery release shown in the figure below. The hollow center contains a lump of solid solute A (drug) in a liquid. Solute A dissolves in the liquid to a maximum concentration cA * = 0.05 m mole A/cm3 and then diffuses radially through the gel layer to the
As part of a process to fabricate materials with ordered pore arrays, the diffusion-limited solvent etching process shown in the figure (next column) is used to remove a contaminant (solid solute A, lithium carbonate) from an array of pores within a slab. There are presently 16 cylindrical pores,
Consider the simplified process shown in the figure below, which is designed to treat a gas-phase mixture of trichloroethylene (TCE) in air by degrading the TCE within a porous catalyst layer of 0.50 cm thickness lining one side of a well-mixed chamber. The inlet composition of TCE is 5.0 mole%,
The immobilized enzyme layer shown in the figure below is designed to convert substrate A to product B according to the simplified reaction A → B with simplified rate equation RA = –kcA. In this process, the steady-state concentrations of substrate A in the bulk liquid and the interface
A gas mixture of constant composition 5.0 mole% CO2 and 95 mole% air flows around a porous, spherical particle of diameter 3.0 cm that initially only contains only air (no CO2) within the gas space of the pores of the particle. At the process conditions of interest (30 C, 1.0 atm), the binary
It is desired to diffuse a blue dye molecule (solute A) into a solid material (species B) near the surface of the material, as shown in the figure below. Initially, there is no dye in the solid (cAo = 0), and the maximum solubility of the dye in the solid is 0.010 gmole/m3. Both the solubility of
A new type of porous material serves as food packaging film, as shown in the figure below. The film rests on a nonporous metal plate. The packaging film is 0.20 cm thick (2.0 mm). The food contains liquid water, which exerts a vapor pressure of 0.030 atm at 25 C. At 25 C, the effective diffusion
A spherical time-release capsule was developed to release pesticide to surrounding soil, as shown in the figure below. The capsule is 1.0 cm in diameter, and is made of a polymer containing a uniform initial concentration of pesticide (species A) equal to 2.0 mg/cm3. The effective diffusion
Air rapidly flows over a 10.0 m x 8.0 m rectangular spill of gasoline (n-octane) at a velocity of 8.0 m/s. The spill occurred within an enclosure where the gas temperature was maintained at 27 C. You may assume that gasoline approximates n-octane (A = n-octane).a. At what position on the liquid
Using the results of Problem 1.7, show that der / dθ = eθ and deθ /dθ = – er.Data From Problem 1.7Show that the unit vectors er and eθ in a cylindrical coordinate system are related to the unit vectors ex and ey byer = ex cos θ + ey sin θandeθ = ex sin θ + ey cos θ
Referring to the figure below, assume the flow to be frictionless in the siphon. Find the rate of discharge in cubic feet per second, and the pressure head at B if the pipe has a uniform diameter of 1 in. How long will it take for the water level to decrease by 3 ft? The tank diameter is 10 ft. 4
Show that equation (16-10) reduces to the form V kVT+q+A=p Du D(gy) ·+p- ·+v・pg +v•µV²v Dt Dt
Derive equation (2-3) from equation (9-27). VP = p(g-a)
A copper cylinder with a diameter of 3 in is initially at a uniform temperature of 70 F. How long after being placed in a medium at 1000 F with an associated convective heat-transfer coefficient of 4 Btu/h ft2 F will the temperature at the center of the cylinder reach 500 F, if the height of the
A thin slab of material is subjected to microwave radiation that causes volumetric heating to vary according towhere qo has a constant value of 180 kW/m3 and the slab thickness, L, is 0.06 m. The thermal conductivity of the slab material is 0.6 W/m K.The boundary at x = L is perfectly insulated,

Fundamentals Of Momentum Heat And Mass Transfer 7th Edition James Welty, Gregory L. Rorrer, David G. Foster - Solutions

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