Department of Mechanical engineering: Recent submissions

Now showing items 201-220 of 1314

Development of vapour compression refigeration system test rig and eavaluation of test data for R134A condensation in compact heat exchangers with serrated Fin

Ranganayakulu, Chennu (International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, 2015)

Two phase flow analysis for the condensation of refrigerants within the compact plate fin heat exchangers is an area of ongoing research. Compact plate fin heat exchangers are becoming very popular due to their high ...
Thermodynamic Analysis of Vapor Compression Refrigeration System for Aircraft with Refrigerant R134a

Ranganayakulu, Chennu (Journal of Aerospace Sciences and Technologies, 2016)

The Environmental Control System (ECS) for a typical fighter aircraft is used for cabin cooling and pressurization, demisting operations, and for avionics cooling. Most of the passenger and fighter aircrafts use Bleed-Air ...
Exergy analysis of aircraft environmental control system

Ranganayakulu, Chennu (IHMTC, 2017)

Traditionally the development of the aircraft, its systems and the associated components revolve around weight optimization and the related design issues. The aircraft environmental control system (ECS) being the maximum ...
Heat Transfer and Friction Correlations for R134a With Offset Strip Fin Surface

Ranganayakulu, Chennu (Journal of Aerospace Sciences and Technologies, 2017)

Single phase heat transfer analysis of R134a refrigerant (liquid phase) has been carried out using Computational Fluid Dynamics (CFD) approach for offset strip fin. Colburn j factor and Fanning friction factor are predicted ...
Experimental investigation on heat transfer coefficients and frictional pressure drop during R134a condensation inside a plate-fin heat exchanger with wavy fin

Ranganayakulu, Chennu (Begell House, 2018)

This paper presents the heat transfer coefficients and frictional pressure drops measured during the saturated vapor condensation of R134a inside a small plate-fin heat exchanger with wavy fin surface for air-conditioning ...
Fundamentals of Finite Element and Finite Volume Methods

Ranganayakulu, Chennu (ASME, 2018)

There are three distinct methods of numerical solution techniques: finite difference, finite volume and finite element methods. The purpose in each is to convert the differential equations into algebraic equations. The ...
Optimization of Aerospace Big Data Including Integrated Health Monitoring With the Help of Data Analytics

Ranganayakulu, Chennu (IGI Global, 2021)

The objective of this chapter is to present the role and advantages of big data governance in the optimal use of integrated health monitoring systems with a specific reference to the aerospace industry. Aerospace manufacturers ...
Configuration Studies of Aircraft Environmental Control System Using Exergy Analysis of Compact Heat Exchangers for Multi-disciplinary Optimization

Ranganayakulu, Chennu (Springer, 2023-03)

Traditionally the performance of an aircraft environmental control system (ECS) is evaluated through energy balance and the weight of the system components is optimised to meet the strength and performance requirements. ...
Numerical Analysis of Generation of Colburn-j Factor for the Plain Rectangular Fins of a Compact Heat Exchanger Using CFD Approach

Ranganayakulu, Chennu (Springer, 2023-04)

A Compact Heat Exchanger is characterized by a high heat transfer area per unit volume, which can be achieved by using very high-density fins. A plain fin is one of the most commonly used fins as it has advantages such as ...
Analysis of Energy saving between Bleed Air and Bleed less Environmental Control Systems in a typical Aircraft

Ranganayakulu, Chennu (IEEE, 2022)

Normally, the required quantity of hot air is drawn from an engine compressor for an Aircraft Environmental Control System (ECS). The present work aims to illustrate the energy saving that can be realized by using a ...
Experimental and CFD analysis of multi nozzle ejector system for aircraft compact heat exchanger applications

Ranganayakulu, Chennu (Taylor & Francis, 2021-10)

In the present study, analysis of multi-nozzle ejector systems for aircraft compact heat exchanger applications is performed. CFD procedure is validated with experimental data of a single-nozzle ejector. Experimentation ...
Multi-Objective Optimization of the Vapour Cycle System of an Aircraft Environmental Control System using Exergy Analysis

Ranganayakulu, Chennu (Begell House, 2021)

The adoption of exergy analysis for aircraft systems is slow. For single phase systems the equations are relatively simple for calculating the exergy destruction and slightly easier to formulate from fundamentals. When it ...
Heat Transfer and Flow Friction correlations for Compact Wavy Plate Fin Heat Exchanger

Ranganayakulu, Chennu (JNTU, 2008)

The most popularly used fins in Compact Heat Exchangers (CHEs) are the plain fins, offset strip fins, louvered fins and wavy fins. Thermo hydraulic performance of the above mentioned fins are strongly depends upon the ...
Heat transfer from horizontal tubes in pool boiling: influence of three-dimensional heat conduction in the wall of the evaporator tube—a finite element analysis

Ranganayakulu, Chennu (Springer, 2005-10)

In pool boiling, the electrically heated tube releases the energy non-uniformly to the liquid, due to different surface roughness and flowing liquid. The heat transfer coefficient therefore varies with axial and azimuthal ...
Condensation heat transfer and pressure drop of R-134a saturated vapour inside a brazed compact plate fin heat exchanger with serrated fin

Ranganayakulu, Chennu (Springer, 2016-05)

This paper presents the experimental heat transfer coefficient and pressure drop measured during R-134a saturated vapour condensation inside a small brazed compact plate fin heat exchanger with serrated fin surface. The ...
Colburn ‘j’ Factor and Fanning Friction Factor ‘f’ Correlations of Triangular Plain Fin Surface of a Compact Heat Exchanger Using CFD

Ranganayakulu, Chennu (Scientific net, 2015)

This paper presents the heat transfer and friction coefficient correlations for triangular plain fin surfaces of plate fin compact heat exchanger. It will be prohibitively expensive and time consuming to fabricate heat ...
Development of Heat Transfer Coefficient and Friction Factor Correlations for Serrated Fins in Water Medium using CFD

Ranganayakulu, Chennu (David Publishing Company, 2015)

The most popularly used fin types in compact heat exchangers are the serrated fins, wavy fins, louvered fins and plain fins. Amongst these fin types the serrated fins assume lot of importance due to its enhanced thermo-hydraulic ...
Measurement of heat transfer coefficient and pressure drops in a compact heat exchanger with lance and offset fins for water based Al2O3 nano-fluids

Ranganayakulu, Chennu (Springer, 2019-07)

Compact Heat Exchangers (CHEs) are widely used in various applications in thermal fluid-systems including aerospace due to their compactness and light weight coupled with high effectiveness. Among the different types of ...
Steady state and transient analysis of compact plate-fin heat exchanger fins for generation of design data using CFD

Ranganayakulu, Chennu (Emerald, 2016-03)

The purpose of this paper is to carry out numerical modeling of single-blow transient analysis using FLUENT porous media model for estimation of heat transfer and pressure drop characteristics of offset and wavy fins
The combined effects of inlet fluid flow and temperature nonuniformity in cross flow plate-fin compact heat exchanger using finite element method

Ranganayakulu, Chennu (Springer, 1997-06)

An analysis of a crossflow plate-fin heat exchanger accouning for the combined effects of inlet fluid flow nonuniformity and temperature nonuniformity on both hot and cold fluid sides is carried out using a Finite Element ...

Now showing items 201-220 of 1314

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