Assume that you have a 16-channel ultrasound system with a linear array transducer (this means that 16 transducer elements are used at a time for beamforming). Assume that the spacing between the centers of the elements is 300 microns. Calculate the time delays for each of the 16 elements for focusing at a point 10 cm from the transducer face. Perform the calculations in MATLAB and plot the delays vs. element numbers. What happens

Steam in a heating system flows through tubes whose outer radius is 2.5 cm and whose walls are maintained at a temperature of 180 °c . circular aluminum alloy 2024-t6 fins ( k= 186 wm. k) of outer radius 3 cm and constant thickness 1 mm are attached to the tube. the space between the fins is 3 mm and thus there are 250 fins per meter of tube length. heat is transferred to the surrounding air at too-25 °c, with a heat transfer coefficient of 40 w/m2. k. manufacturer a claims that this system is rated at 3.5 kw per meter of tube length. if the fins are an integral part of the steam tube, find the heat transfer rate in kw for a 1-m length of tube. is manufacturer a's claim valid? compare the heat transfer rate from 1 meter of tube length if there are no fins.