Concept explainers
One of your colleagues has designed a new transdermal patch to deliver insulin through the skin to diabetic patients in a controlled way, eliminating the need for painful injections. She hascollected the following data on the mass flux of insulin being delivered through the patch (and skin) as a function of time:
Flux, Mg/cm2/h | Time, h | Flux, Mg/cm2/h | Time, h |
15 | 0 | 8 | 5 |
14 | 1 | 5 | 10 |
12 | 2 | 2.5 | 15 |
11 | 3 | 2 | 20 |
9 | 4 | 1 | 24 |
Remember that mass flux is flow rate through an area or
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Chapter 24 Solutions
EBK NUMERICAL METHODS FOR ENGINEERS
- number 1 A food product containing 80% moisture content is being frozen. Estimate the specific heat of the product at -8 ° C when 80% of the water is frozen. The specific heat of the dry product is 2 kJ / (kg ° C). It is assumed that the specific heat of water at -10 ° C is the same as the specific heat of water at 0 ° C, and that the specific heat of ice follows the function Cp es = 0.0062 T Frozen + 2.0649. Cp of frozen product = kJ / kg ° C.arrow_forwardAt 250C, the interfacial tension between water and n – octyl alcohol is 8.50 dyne/cm. if the surface tension of n-octyl is 27.53 dyne/cm and that of the water is 72.75 dyne/cm, predict whether water spreads on the alcohol by calculating a) Work of cohesion of n-octyl b) Work of adhesion and c) the spreading coefficient of water on the alcohol. Will alcohol spread on water?arrow_forwardexplain this graph Conductivity Concentration of KCL vs Conductivity 160 140 y = 240.17x + 2.5021 R? = 0.7371 120 100 80 60 40 20 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Concentration of KCLarrow_forward
- The processing of raw coal involves “washing,” in which coal ash (nonorganic, incombustible material) is removed. The article “Quantifying Sampling Precision for Coal Ash Using Gy’s Discrete Model of the Fundamental Error” (Journal of Coal Quality, 1989:33–39) provides data relating the percentage of ash to the volume of a coal particle. The average percentage of ash for six volumes of coal particles was measured. The data are as follows: Volume (cm3) 0.01 0.06 0.58 2.24 15.55 276.02 Percent ash 3.32 4.05 5.69 7.06 8.17 9.36 Using the most appropriate model, predict the percent ash for particles with a volume of 48 cm3. Round answer to three decimal places. * the answer i got was of 6.260 was wrongarrow_forwardTo determine the thermal conductivity of a structural material, a large 15-cm-thick slab of the material is subjected to a uniform heat flux of 2500 W/m2 while thermocouples embedded in the wall at 2.5 cm. intervals are read over a period of time. After the system had reached equilibrium, an operator recorded the thermocouple readings shown below for two different environmental conditions: Distance from the Surface (cm) Temperature (C) Test 1 0 40 5 65 10 97 15 132 Test 2 0 95 5 130 10 168 15 208 From these data, determine an approximate expression for the thermal conductivity as a function of temperature between 40 and 208C.arrow_forwardQI: Write a material balances and pressure drop equations for the following pipes network: 90 is 55 600 m 45 254 mm 10 600 m 254 mm C 35 +ve 600 m C 152 mm 600 152 mm 15 60V 600 m 152 mm 600 m 152 mmarrow_forward
- On average, a pair of running shoes can last 18 months if used every day. The length of time running shoes last is exponentially distributed. What is the probability that a pair of running shoes last more than 15 months? Eighty percent of running shoes last at most how long if used every day?arrow_forwardThe error, defined for normal (reference) conditions is: Select one: 1. Random Error 2. Intrinsic Error 3. Systematic Error 4. Influence Errorarrow_forwardA pressure measuring device has been analyzed and it has been determined that the response of the device to pressure changes resembles the dynamic behavior of quadratic systems. When the P inlet pressure of the device was increased from 4lb/in² to 6 lb/in2 by the step effect, the following graph of the Pm (%) output was obtained. Pm (%) 30 26 22 18 14 10 * 0 X X X X 20 X x x x 40 XX X time ( minutes) a) Calculate my gain in a calm state. b) We calculate the time constant. e) Calculate my damping coefficient. d) We will calculate my reduction rate. e) Calculate the saline period. f) Create the transfer function. g) Determine the poles of the transfer function. 60 X x XX 80 x xx 100arrow_forward
- True or False High-tech research in Singapore includes the elusive but all-consuming invention that drove Nicola Tesla - Wireless Power Transfer.arrow_forwardTo measure the density of a stone, a digital scale and a beaker cup filled with water are used. The balance is used to measure the mass of the stone, while the beaker is used to measure the volume of the stone. It is known that the digital balance has a resolution of 0.1 g and that the beaker cup has a resolution of 5 ml. Repeated mass measurements return the following values: 250.0 g; 249.9 g; 250.3 g; 249.6g; 250.1 g; 249.7g; 250.4 g; 250.0 g; 248.8 g; 250.2 g The volume is measured only once. Placing the stone in the beaker, a volume of displaced water equal to 50 ml is measured. Using a k=2.5, check if the density of the stone is compatible or out of line with the value ρ = (4910 ± 65) kg.m-3 (a) none of the above (b) the values are compatible (c) missing data to perform the compatibility test (d) the values are discrepantarrow_forwardAn unmanned submarine is equipped with temperature and depth measuring instruments and has radio equipment that can transmit the output readings of these instruments back to the surface. The submarine is initially floating on the surface of the sea with the instrument output readings in steady state. The depth measuring instrument is approximately zero order and the temperature transducer first order with a time constant of 50 seconds. The water temperature on the sea surface, , is 20 °C and the temperature at a depth of x meters is given by the relation: If the submarine starts diving at time zero, and thereafter goes down at a velocity of 0.5 meters / second, draw a table showing the temperature and depth measurements reported at intervals of 100 seconds over the first 500 seconds of travel. Show also in the table the error in each temperature reading.What temperature does the submarine report at a depth of 1000 meters?arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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