PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Chapter 18, Problem 51P
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Combustion gases from the exhaust of a boiler that come out at 300 °C and 1 atm, are usedto preheat to preheat water in an industrial facility by passing them through a benchof tubes, within which there is a mass flow of liquid water of 6 kg/s. TemperatureThe average wall surface of all pipes is 80°C. Gases enter the bank ofPerpendicular shaped tubes with a velocity of 4.5 m/s. The outer diameter of the tubes isof 2.1 cm, which are arranged in a manner aligned with longitudinal and transverse steps ofSL = ST = 8 cm. There are 16 columns in the direction of flow with eight tubes in each.Whereas exhaust gases have properties very similar to atmospheric air,Calculate the following:a) The average coefficient of heat transfer by convection, in [W/m2K]. (b) The amount of heat transferred per unit length of the tubes, in [W/m] c) The pressure drop through the tube bank, in [kPa]
During a visit to a plastic sheet factory, it is observed that a section of 45 mlength of a steam pipe, with a nominal diameter of 2 inches (6.03 cm in diameter)Outdoor plant) extends from one end of the plant to the other without any insulation. TheTemperature measurements at various points on the tube surface gave an average value170 °C, while the surrounding air temperature is 20 °C. The outer surfaceof the pipe is oxidized and its emissivity is 0.7 on average with a temperature of thearound 22 °C. Calculate the following:(a) The coefficient of convective heat transfer for the air surrounding the pipe.b) The amount of heat lost by convection and radiationc) The amount of energy that is lost in a full day, assuming conditions ofconstant temperature.
Chapter 18 Solutions
PEARSON ETEXT ENGINEERING MECH & STATS
Ch. 18 - The 80-kg wheel has a radius of gyration about its...Ch. 18 - The uniform 50-lb slender rod is subjected to a...Ch. 18 - The uniform 50-kg slender rod is at rest m the...Ch. 18 - The 50-kg wheel is subjected to a force of 50 N....Ch. 18 - If the uniform 30-kg slender rod starts from rest...Ch. 18 - The 20-kg wheel has a radius of gyration about its...Ch. 18 - At a given instant the body of mass m has an...Ch. 18 - A force of P = 20 N is applied to the cable, which...Ch. 18 - A force of P = 20 N is applied to the cable, which...Ch. 18 - The double pulley consists of two parts that are...
Ch. 18 - The double pulley cons1sts of two parts that are...Ch. 18 - Prob. 9PCh. 18 - The 10-kg uniform slender rod is suspended at rest...Ch. 18 - Prob. 14PCh. 18 - The pendulum consists of a 10-kg uniform disk and...Ch. 18 - The center O of the thin ring of mass m is given...Ch. 18 - Prob. 18PCh. 18 - Prob. 19PCh. 18 - Prob. 22PCh. 18 - Prob. 23PCh. 18 - Prob. 27PCh. 18 - The 10-kg rod AB is pin connected at A and...Ch. 18 - Motor M exerts a constant force of P = 750 Non the...Ch. 18 - The two 2-kg gears A and B are attached to the...Ch. 18 - F187. If the 30-kg disk is released from rest when...Ch. 18 - The 50-kg reel has a radius of gyration about its...Ch. 18 - The 60-kg rod OA is released from rest when = 0....Ch. 18 - Prob. 10FPCh. 18 - The 30-kg rod is released from rest when = 45....Ch. 18 - Prob. 12FPCh. 18 - Prob. 36PCh. 18 - Prob. 37PCh. 18 - The 40-kg wheel has a radius of gyration about its...Ch. 18 - The assembly consists of two 10-kg bars which are...Ch. 18 - The assembly consists of two 10-kg bars which are...Ch. 18 - Prob. 51PCh. 18 - Prob. 52PCh. 18 - If the 250-lb block is released from rest when the...Ch. 18 - The slender 15-kg bar is initially at rest and...Ch. 18 - The 50-lb wheel has a radius of gyration about its...Ch. 18 - The system consists of 60-lb and 20-lb blocks A...Ch. 18 - The pendulum of the Charpy impact machine has a...Ch. 18 - Prob. 2RPCh. 18 - The drum has a mass of 50 kg and a radius of...Ch. 18 - The spool has a mass of 60 Kg and a radius of...Ch. 18 - Prob. 5RPCh. 18 - At the Instant shown, the 50-lb bar rotates...Ch. 18 - Prob. 7RPCh. 18 - Prob. 8RP
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