Bulk-density cylinder

Figure 15.7 Bulk-density cylinder of known volume (40 cm ) filled with powder during flow rate test.

Bulk Density. Bulk density of fine mica is deterrnined with a Scott-Schaeffer-White volumeter using a 2.54-cm cube. A 7.6-cm diameter cylinder x 12.7-cm long is used to determine the bulk density of coarse mica, eg, oil-weU-grade mica. 

Polyvinyl chloride cylinders -1- nylon gauze -1- device for continuous water supply Soil slices at measurable distance from soil-root interface. High bulk density of soil sampled. Nutrient uptake through an induced root hairs surface. Study of rhizosphere effect over a time and distance gradient from the soil-root interface. 47, 67, 127-129... 

The most common method for measuring bulk density is to pour the powder into a tared graduated cylinder and measure the bulk volume (Vb) and mass of the material. Other methods, however, have been employed to ensure reproducibility, and a standard procedure has been reported [62,64]. For this testing, a sample of 50 g is passed through a U.S. Standard No. 20 sieve and is poured into a 100-ml graduated cylinder. The cylinder is then dropped from a height of 1 inch onto a hard surface three times at 2-second intervals. The volume of the powder is then read and used to calculate the bulk density. This three-tap method was found to give consistent results between laboratories. 

Tap density (ptap) is an extension of bulk density measurements, and the procedure used to measure the tap density again varies from lab to lab and can affect the final results. To measure tap density, a graduated cylinder is filled with powder and the weight and volume are recorded. The difference observed between procedures is the number of taps used for the measurement. In some cases, a particular number of taps is used, such as 200 [65], 500 [66], or even 1000 taps [67]. Other procedures involve tapping the cylinder for a number of times, recording the volume, and repeating the procedure until the volume remains constant [68]. This method ensures more consistent results. 

The bulk density of a sample of rock salt (sodium chloride) is to be determined. An empty 100-mL graduated cylinder had a mass of 123.248 g. Rock salt was dispensed into the cylinder at a rate of 1 mL/sec until it reached 100 mL. The graduated cylinder was reweighed and had a mass of 286.587 g. What is the bulk density of the rock salt ... 

Bulk density. Fill with dry DADNPh a special, accurately tared (W ), hollow metallic cylinder of 1-cc capacity. To achieve this, hold the cylinder in a vertical position with open end up and pour the material f rom a folded piece of glazed paper held at the mouth of the cylinder. Remove the surplus of material from the top and after leveling... 

Bulk Density. Bulk density was determined by the tapping method. Powder (30 gm) was loosely weighed into a 100 ml graduated cylinder. Cylinder with the powder was tapped on a flat surface to a constant volume. The final volume was recorded. Bulk density was calculated by dividing the sample weight by the volume. 

One of the most important properties of a material is its density, for which there are several expressions, namely, bulk, particle, and skeletal densities. The bulk density of solids is the overall density of the material including the interparticle distance of separation. It is defined as the overall mass of the material per unit volume, which can be determined by simply pouring a preweighed sample of particles into a graduated cylinder and measuring the volume occupied. The material can become denser with time and settling, and its bulk density reaches a certain limiting value, known as the tapped or packed bulk density. 

The catalyst used was Katalco 23-1 Primary Reforming Catalyst, a commercial nickel reforming catalyst supported on alumina. Its chemical composition was reported as 10-14% NIO, 0.2% SIO2 balance AI2O3. It was supplied as hollow cylinders of size 5%-in O.D., 5/16-in 1.0. and 3/8-1n long, and had an apparent bulk density of 66 5 lb/ft. The rings were crushed and sieved to obtain the 24/32 mesh cut used In all of the experiments. 

The feed capacity depends on the free screw volume (channel depth, number of threads), the pitch, the screw speed, and the bulk density of the product. The product can only be conveyed if there is friction between the product and the cylinder wall. 

Bulk density, or packing density, includes all pores and voids (interparticle spaces) in its calculation. It is determined by filling a graduated cylinder, with or without tapping. It follows that the value obtained is dependent upon the form of the catalyst (powder, tablets, extrudates) because of the different contribution of interparticle void space to the pore volume. Tap density is the apparent density of a bed of particles in a container of stated dimensions when a given amount of powder is vibrated or tapped under controlled conditions. The use of the term bulk density should be... 

The most convenient method to measure bulk density is to fill the particles into a known volume container (usually cylindrical), level the surface, and weigh the particles in the container. The bulk density is calculated by the mass of the particles divided by the volume that can be read from the scale of the measuring cylinder. In order to minimize experimental errors, the container should be ideally at least 1L in volume, and the ratio of length and diameter should be about 2 1. Also it is recommended to leave the sample for approximately 10 min to achieve an equilibrium volume (density) value before making readings. 

Suppose 600.0 g of a crushed ore is placed in a graduated cylinder, filling it to the 184 cm level. One hundred cm of water is then added to the cylinder, whereupon the water level is observed to be at the 233.5 cm mark. Calculate the porosity of the dry particle bed, the bulk density of the ore in this bed, and the absolute density of the ore. 

The bulk density is measured by adding the wood meal little by little to a too c.c. measuring cylinder, which is knocked on the table after each addition to shake the wood meal down. The quantity which fills too c.c. is weighed. 

Another extremely important micromeritic parameter is powder density, which is defined as the ratio of mass to volume. Three types of density, which differ in their determination of volume occupied by the powder, are normally differentiated. Bulk density is obtained by measuring the volume of a known mass of powder sample (that has been passed through a mesh screen) into a suitable volume-measuring apparatus. When a graduated cylinder is used for the measurement, the volume is determined to the nearest milliliter. The bulk... 

C. The catalyst will consist of 0.20 by 0.20-in. cylinders, and the bulk density of the packed bed may be taken as 50 Ib/ft for each size of tube. The superficial mass velocity of g es through each tube will be 400 lb/(hr) (ft tube area). Use the one-dimensional design procedure. 

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