A material was dried in a tray-type batch dryer using constant-drying conditions. When the initial free...

A material was dried in a tray-type batch dryer using constant-drying conditions. When the initial free moisture content was 0.28 kg free moisture/kg dry solid, 6.0 h was required to dry the material to a free moisture content of 0.08 kg free moisture/kg dry solid. The critical free moisture content is 0.14. Assuming a drying rate in the falling-rate region, where the rate is a straight line from the critical point to the origin, predict the time to dry a sample from a free moisture content of 0.33 to 0.04 kg free moisture/kg dry solid. (Hint: First use the analytical equations for the constant-rate and the linear falling-rate periods with the known total time of 6.- h. Then use the same equations for the new conditions.)

Solutions

Expert Solution

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

Assuming a constant drying condition,a pile of meat wet solid was dried on a tray dryer.The...

Assuming a constant drying condition,a pile of meat wet solid was dried on a tray dryer.The thickness of material on the tray is 35.4 mm. Only top surface with an area of 0.45 m2 was exposed to drying. It took approximately 3.9 hours to dry 12.0 kg wet meat from its initial free moisture of 0.55 kg free moisture/kg dry meat to its critical moisture content of 0.22 kg free moisture/ kg dry meat. Evaluate the time to dry a...

A wet solid is dried from 40% to 10% moisture under constant drying conditions in 5...

A wet solid is dried from 40% to 10% moisture under constant drying conditions in 5 hours. If the equilibrium moisture content is 0.0416 kg moisture/kg dry solid and the critical moisture content is 14%, how long will it take to dry from 40% to 5% moisture under the same conditions. All percentages other than equilibrium moisture content are on wet basis. Assume linear relation between rate of drying and moisture content during falling rate period.

A dryer is operated with a material containing 10% H2O (by mass) to a final dried...

A dryer is operated with a material containing 10% H2O (by mass) to a final dried material containing 5% H2O (by mass). The fresh air is mixed with recycled air and is blown over the solid. The fresh air contains 0.008 kg H2O/kg dry air and the recycled air contains 0.08 kg H2O/kg dry air. For 1000 kg of wet material fed to the dryer. Calculate (a) weight of H2O removed, (b) weight of dry air in the fresh air...

A dryer is operated with a material containing 10% H2O (by mass) to a final dried...

You are given a material which produces no initial magnetic field when in free space. When...

You are given a material which produces no initial magnetic field when in free space. When it is placed in a region of uniform magnetic field, the material produces an additional internal magnetic field parallel to the original field. However, this induced magnetic field disappears when the external field is removed. What type of magnetism does this material exhibit? diamagnetism paramagnetism ferromagnetism Once again, you are given an unknown material that initially generates no magnetic field. When this material is...

The drying time of a type of paint under specified test conditions is known to be...

The drying time of a type of paint under specified test conditions is known to be normally distributed with mean value 75 min and standard deviation 9 min. Chemists have proposed a new additive designed to decrease average drying time. It is believed that drying times with this additive will remain normally distributed with σ = 9 min. Because of the expense associated with the additive, evidence should strongly suggest an improvement in average drying time before such a conclusion...

1. Initial franchise fee revenue should be recognized when all material services or conditions relating to...

1. Initial franchise fee revenue should be recognized when all material services or conditions relating to the sale have been substantially performed by the franchisor. True or False 2. Under ASC Topic 606 for revenue recognition, a performance obligation is considered satisfied when control over the goods and services is transferred to the customer. Which of the following is not an indicator that control has transferred? a. All of these are indicators that control has transferred. b. The customer is...

When analyzing recursive algorithms, which of the following best describes initial conditions? a) Initial conditions express...

When analyzing recursive algorithms, which of the following best describes initial conditions? a) Initial conditions express the number of times the basic operation executes when the base case is reached. b) Initial conditions represent the condition for the base case of a recursive function c) Initial conditions express the number of times the basic operation runs during the first execution of the function. d) Initial conditions express the complexity of an algorithm

which type of gear material used for making a gear using in jurk?

4) when using a drying agent (sodium sulfate for example) to dry an organic layer, how...

4) when using a drying agent (sodium sulfate for example) to dry an organic layer, how do you determine if your layer is dry? 5) you purified a solid by recrystallization. describe the specifics as to why you did this. why was water chosen as the recrystallizzation solvent. why did you skip hot filtration? di something not go as planned? all crude samples were approximately 90% pure, which means that in an ideal world your recovery would be about 90%....

Subjects