... material, poly-ether-ether-ketone (PEEK) and stainless steel. The parameters of the experiment were used in the calculations. CO 2 was used as the coolant gas for inlet pressures from 0.5 MPa to 2.0 MPa. Heat load trials of up to 550 mW along with unloaded trials were conducted. The temperature...

... across the microchannels. A database of 49 data points obtained from five experiments in four independent studies with water, R-113, and FC-77 as coolants was compiled and analyzed. It is found that the CHF has a strong dependence on the coolant, the flow rate, and the area upon which the heat flux...

... applied a one-dimensional model of the heat sink, validated by the experiments. We predicted the potential of nanofluids to increase the performance of microchannel heat sinks. To this end, we varied the individual thermophysical properties of the coolant and studied their impact on the heat sink...

...Jay C. Rozzi; John K. Sanders; Weibo Chen Cutting fluids have been used in machining processes for many years to decrease the temperature during machining by spraying the coolant into the machining zone directly on the cutting tool and the part. This has the effect of decreasing the tool...

... of the solid disk at t = 0 , and heat transfer was monitored for the entire duration of the transient until the steady state condition was reached. Calculations were done for a number of disk materials using water as the coolant, covering a range of Reynolds numbers (225–900), Ekman numbers ( 7.08 × 10 − 5...

...C.-J. Kuo; Y. Peles Flow boiling was experimentally studied using coolant HFE-7000 for two types of parallel microchannels: a plain-wall microchannel and a microchannel with structured reentrant cavities on the side walls. Flow morphologies, boiling inceptions, heat transfer coefficients...

... cross-section by 670 μ m height were fabricated into a copper test section. De-ionized water was used as the cooling liquid. Two coolant inlet temperatures of 30 ° C and 6 0 ° C and six maximum mass velocities for each inlet temperature ranging from 183 to 420 kg / m 2 s were tested. The corresponding...

... of the present solution are found to be in good agreement with other analytical solutions obtained through the Weiner–Hopf technique and the separation of variables as well as with the published experimental data for different coolants over a varied range of coolant flow rate. It is seen that precursory cooling...

... on temperature field and thermal effectiveness is discussed using the analytical solution. Two physical criteria, if the analytical solution of coolant temperature may be higher than hot gas temperature at steady state and if the variation trend of thermal effectiveness with coolant mass flow rate at hot surface...

...Fuguo Zhou; Jonathan Lagrone; Sumanta Acharya Heat transfer and pressure drop measurements are reported for a rotating 4:1 aspect ratio (AR) smooth two-pass coolant passage for Reynolds number in the range of 10,000–150,000, rotation number in the range of 0–0.6, and density ratios in the range...

...Yiping Lu; Hasan Nasir; David Faucheaux; Srinath V. Ekkad Experimental Procedure: •Blower is set appropriately for required mainstream velocity •Heater is turned on and allowed to heat the air to a desired mainstream temperature •The coolant air is provided from separate compressed air supply...

...Shyy Woei Chang; Tong-Minn Liou; Jui-Hung Hung; Wen-Hsien Yeh This paper describes an experimental study of heat transfer in a radially rotating square duct with two opposite walls roughened by 45 deg staggered ribs. Air coolant flows radially outward in the test channel with experiments...

...J. H. Wang; H. N. Wang To study transpiration cooling problems, an analytical solution of the local thermal nonequilibrium (LTNE) model with the second or third boundary conditions is presented. This solution is obtained through neglecting the thermal conduction of the fluid coolant in porous media...

... cooling techniques are essential for surpassing these current limits. This paper investigates the potential of film-cooling enhancement by injecting mist into the coolant. The computational results show that a small amount of injection (2% of the coolant flow rate) can enhance the adiabatic cooling...

... ∕ P = 2 and α = 30 ° , the second S ∕ P = 1 and α = 30 ° , and the third S ∕ P = 2 and α = 150 ° . Measurements were performed at different blow ratios ( M = 1 - 4 ) . Streamwise coolant injection offers high cooling protection for downstream rows. Reverse coolant injection provides superior cooling...

...Takahiro Murase; Adrian Briggs; Hua Sheng Wang; John W. Rose Measurements for film condensation of steam, R113 and ethylene glycol on a horizontal wire-wrapped tube are reported. All measurements were made at near atmospheric vapor pressure and with coolant at around 20 ° C . Care was taken...

... jets or a nozzle to form the spray; a container to hold the nozzle, the heat source and the cooling liquid, which also serves as a heat exchanger to the ambient; and a pump which recirculates the coolant. A fan could be used to improve the heat transfer to the ambient, and it would allow the use...

... Division December 11, 2002; revision received October 17, 2003. Associate Editor: D. B. R. Kenning. 11 December 2002 17 October 2003 16 06 2004 sprays cooling nozzles swirling flow organic compounds coolants drops two-phase flow Boiling Cooling Heat Transfer Sprays...