Transient Heat Transfer Analysis of a Solid with a Protective Fabric System under Hot Air Jet Impingement [Thesis Report]

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1 TRANSIENT HEAT TRANSFER ANALYSIS OF A SOLID WITH A PROTECTIVE FABRIC UNDER HOT AIR JET IMPINGEMENT by Aashique Alam Rezwan (Std. No. 06 10 012) Sarzina Hossain (Std. No. 06 10 063) Supervised by Dr. Md. Ashraful Islam Professor, Dept. of Mechanical Engineering, BUET Department of Mechanical Engineering Bangladesh University of Engineering & Technology, Dhaka – 1000, Bangladesh March 2012 2 TRANSIENT HEAT TRANSFER ANALYSIS OF A SOLID WITH A PROTECTIVE FABRIC UNDER HOT AIR JET IMPINGEMEN
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   1 TRANSIENT HEAT TRANSFER ANALYSIS OF ASOLID WITH A PROTECTIVE FABRIC UNDERHOT AIR JET IMPINGEMENT byAashique Alam Rezwan (Std. No. 06 10 012)Sarzina Hossain (Std. No. 06 10 063)Supervised byDr. Md. Ashraful IslamProfessor, Dept. of Mechanical Engineering, BUETDepartment of Mechanical EngineeringBangladesh University of Engineering & Technology,Dhaka  –  1000, Bangladesh   March 2012   2 TRANSIENT HEAT TRANSFER ANALYSIS OF ASOLID WITH A PROTECTIVE FABRIC UNDERHOT AIR JET IMPINGEMENT byAashique Alam Rezwan (Std. No. 06 10 012)Sarzina Hossain (Std. No. 06 10 063)Supervised byDr. Md. Ashraful IslamProfessor, Dept. of MechE, BUETSubmitted to theDepartment of Mechanical EngineeringBangladesh University of Engineering & Technology,Dhaka  –  1000, Bangladesh March 2012 The authors hereby grants to BUET permission to reproduce and todistribute publicly paper and electronic copies of this thesis document in whole or in part in anymedium now known or hereafter created.   3 DISCLAIMER This is to certify that the works on Transient Heat Transfer Analysis of a Solid with a ProtectiveFabric under Hot Air Jet Impingement presented in this thesis carried out by the authors AashiqueAlam Rezwan (Std. No. 06 10 012) & Sarzina Hossain (Std. No. 06 10 063) under the supervision of  Dr. Md. Ashraful Islam, Professor, Dept. of MechE, BUET.  It is hereby declared that this thesis or any part of it has not been submitted elsewhere for the award of any degree or diploma.Authors   4 ABSTRACT   The present study focuses on the performance of fire protective clothing under the flame blastcondition. This investigation has been conducted using a hot air jet that is impinged normally on a baseplate with/without protective fabric to mimic the flame blast condition. The air jet temperature is 125  ° Cand the jet velocity is 15 m/s and 19 m/s. The temperatures at various radial positions of the solid aremeasured by thermocouples and are used to calculate the surface heat flux transferred to the solid baseplate. Subsequently, the local heat transfer coefficient and the local Nusselt Number for different radialpositions of the base plate have been estimated, exhibited and analyzed for different longitudinal distancesbetween nozzle and base plate with/without protective fabric. A numerical simulation model has beendeveloped and validated for the same purpose. Both the experimental and simulation results show asignificant decrease in heat transfer rate using the protective fabric.   Keywords: Transient Heat Transfer, Jet Impingement, Hot Air Jet, Fire Protective Fabric.
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