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Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Transcribed Image Text:A Compressed air 3-axis robotic Temperature sensor Heatable syringe Bioprinting is an additive manufacturing process similar to 3D printing - it uses a digital file as a blueprint to print an object layer by layer. But unlike 3D printing, bioprinters print with cells and biomaterials, creating organ-like structures that let living cells multiply. It has been used to create artificial ears, arms, and hearts. 3D-Bioprinting System Cell/gel suspension Micro valve D P |__μ g h Р Crosslinker solution Symbol Unit m kg/m³ Density of the fluid Pa*s Dynamic viscosity Gravity m/s² E Ф Perfluorocarbon (PFC) 4 HE Researchers haven't fully understood the relationship between the printing process and the physical property of the products. You are assigned a task to find the important non- dimensional groups that govern the process. From pilot studies, these factors are found important in the printing process: m Pa Pa % B 3+² =ū-11- Description Inner diameter of the needle Height above the surface Monomer Viable cell Stressed cell Dead cell 1) The velocity profile in the needle follows -(¹) Driving pressure Young's modulus of the product Percentage of living cells Static Flow u(r) where ū is the average velocity, n is a constant. If the shearing stress can be calculated using du T = μ find the expression of the maximum shear stress dr' 2) Where has the maximum shear stress and what's the expression 3) We know that cells will die if the shear stress exceeds 5 Pa. If the needle has an inner diameter of 1 mm, n=1, and the viscosity of the fluid is 2x10-³ Pa*s, calculate the maximum average velocity to ensure all cells are alive

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