NUMERICAL INVESTIGATION OF NUCLEATE BOILING HEAT TRANSFER ON THIN SUBSTRATES UNDER THE INFLUENCE OF SURFACE ROUGHNESS
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 5, Issue 3
Abstract
The effect of surface roughness on nucleate boiling heat transfer is analytically explored over a wide range of roughness values in water and Flourinent FC-77,two fluids with different thermal poperties and wetting characteristics.The test surfaces ranged from a polished surface of 0.045μm to 10.5μm.Different trends were observed in the heat transfer coefficient ,percentage of vapour and Vapour generated time with respect to surface roughness between the two fluids on the same set of surfaces.For FC-77,the percentage of vapour developed was increased continually with increasing roughness.For water,on the other hand,surfaces of intermediate roughness and maximum roughnessdisplayed similar values of percentage of vapour.While the roughest surface showed maximum percentage of vapour.The heat transfer coefficients and percentage of vapour developed were more strongly influenced by Fc-77than with water.At a very least vapour generated time of 0.4sec Fc-77 developed maximum percentage of vapour than with water.
Authors and Affiliations
U. Ramya Sri
Power Quality Improvement using FC-TCR (SVC) with Fuzzy Logic Controller
To transmit or distribute fixed amount of power at fixed voltage, the conductor have to carry more current at low power factor. This necessities a large conductor size. The large current at low power factor cause more c...
Analysis, Evaluation and Simulation of Direct Torque Control of Induction Motor Using SVPWM Technique
Induction machine drive based on Direct Torque Control (DTC) allows high dynamic performance with very simple hysteresis control scheme. Conventional Direct Torque Control (CDTC) suffers from some drawbacks such...
Comparative Analysis of IPV6 Based IS-IS and OSPF-V3 Protocols
This paper deals with the critical issues of OSPF V3 & IS-IS in IPV6. As IPV6 is becoming popular day by day; due to its wide range of applications; and great hierarchy of IPs. But selecting the best protocol...
Current Source Control Phase Shifting For Minimization of Harmonic Current in Distribution System
Power electronic loads inject harmonic currents into the utility system. This paper presents a comparative evaluation of harmonic reduction techniques which satisfy the current harmonic limits specified by the IEE...
A Survey on Software Fault tolerance in Parallel Computing
Software almost inevitably contains defects. Do everything possible to reduce the fault rate; Use faulttolerance techniques to deal with software faults. Fault tolerance is the ability of a system to perform its functio...