NDLI: Two Phase Flow Simulation for Nucleate Boiling Heat Transfer Calculation in Waterjacket of Diesel Engine

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mohammadi, Arash Hashemi, Hossein Jazayeri, Ali Ahmadi, Mahdi
Copyright Year	2011
Abstract	Basic understanding of the process of coolant heat transfer inside an engine is an indispensable prerequisite to devise an infallible cooling strategy. Coolant flow and its heat transfer affect the cooling efficiency, thermal load of heated components, and thermal efficiency of a diesel engine. An efficient approach to study cooling system for diesel engine is a 3D computational fluid dynamics (CFD) calculation for coolant jacket. Therefore, computer simulation can analyze and consequently optimize cooling system performance, including complex cooling jacket. In this paper a computational model for boiling heat transfer based on two-phase Mixture model flow is established. Furthermore, the phenomenon of nucleate boiling, its mathematical modeling, and its effect on heat transfer is discussed. Besides, the static, total and absolute pressure, velocity and stream lines of the flow field, heat flux, heat transfer coefficient and volume fraction of vapor distribution in the coolant jacket of a four-cylinder diesel engine is computed. Also, comparison between experimental equation (Pflaum/Mollenhauer) and two-phase Mixture model for boiling hat transfer coefficient is done and good agreement is seen. In conclusion, it is observed that at high operating temperatures, nucleate boiling occurs in regions around the exhaust port. Numerical simulation of boiling heat transfer process of cooling water jacket and temperature field in the cylinder head of the diesel engine is compared with the data measured on the engine test bench. The calculated results indicate that this method can reflect the impact of boiling heat transfer on water jacket rather accurate. Therefore, this method is benefit to improve the computational precision in the temperature field computation of a cylinder head.
Sponsorship	Fluids Engineering Division
Starting Page	1721
Ending Page	1729
Page Count	9
File Format	PDF
ISBN	9780791844403
DOI	10.1115/AJK2011-04038
Volume Number	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
Conference Proceedings	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
Language	English
Publisher Date	2011-07-24
Publisher Place	Hamamatsu, Japan
Access Restriction	Subscribed
Subject Keyword	Water Temperature Vapors Cooling systems Modeling Engines Heat flux Exhaust systems Diesel engines Two-phase flow Nucleate boiling Coolants Cylinders Cooling Computational fluid dynamics Computer simulation Boiling Flow (dynamics) Pressure Stress Simulation Computation Thermal efficiency Heat transfer coefficients Heat transfer Operating temperature
Content Type	Text
Resource Type	Article

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