Fluid enters a tube with a flow rate of 0.015 kg/s and an inlet temperature of 20 degree c.
the tube, which has a length of 6 m and diameter of 15 mm, has a surface temperature of 30 degree c.

a)determine the heat transfer rate to the fluid if it is water.

b)determine the heat transfer rate for the nanofluid of example 2.2.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?

An ideal gas expands in an adiabatic turbine from 1200 k and 900 kpa to 800 k. determine the turbine inlet volume flow rate of the gas, in m'/s, required to produce turbine work output at the rate of 650 kw. the average values of the specific heats for this gas over the temperature range and the gas constant are op 1.13 kj/kg.k, v 0.83 kj/kg k, and r 0.30 kj/kg k