A14 (single shell pass, four tube-side passes) heat exchanger is to be designed to heat liquid from 300 k to 370 k. the heating medium enters the shell-side at 430 k and leaves at 380 k. if 10 kg/s of cold liquid is supplied, find the heat transfer area required and suggest a suitable tube arrangement. if the hot fluid outlet temperature drops to 360 k, is the design method still valid? if not, why not?

Two microscope slides are placed horizontally, one on top of the other, with a drop of a dishwashing liquid between them. the gap between the slides is 1 mm. a machine pulls the top slide to the right with a velocity of 0.15 millimeters per second while the bottom slide is held stationary. a stress gage indicates that a shearing stress of 0.5 pa is required to pull the top slide with this velocity. if the dishwashing liquid adheres to both slides during this process, what is the viscosity of the liquid? specify whether your answer is dynamic or kinematic viscosity, and use appropriate units.