Flow Characteristics of Water-HPC Gel in Converging Tubes and Tapered Injectors

Gelled fuels combine the main advantages of liquid fuels (throttle ability) and solid fuels (easy handling, etc.) due to their non-Newtonian characteristics. In this paper, we study the flow characteristics of water-hydroxypropylcellulose (HPC) gel in converging tubes and tapered injectors which mimic the flow and injection of kerosene gel in typical geometries of propulsion systems. The water-HPC gel is modeled as a non-linear fluid, where the shear viscosity is assumed to depend on the local shear rate and modeled by the Carreau–Yasuda model; the model parameters are fitted with our experimental measurements done by a rotational rheometer. The numerical simulations indicate that for the converging tubes, increasing the convergence angle, causes the mean apparent viscosity at tube exit to decrease while the mass flow rate reduces at a constant pressure drop. Therefore, there is a balance between the lowering of the pressure loss and reducing mean apparent viscosity. In the tapered injectors, the straight pipe after the converging part has a detrimental effect on the viscosity reduction.

[1]  Nadine Aubry,et al.  Heat transfer and flow of a dense suspension between two cylinders , 2017 .

[2]  Travis D. Kubal,et al.  Rheological Characterization of Hydroxypropylcellulose/Monomethylhydrazine and\r\nSilica/Red Fuming Nitric Acid Gels , 2010 .

[3]  John C. Slattery,et al.  Advanced transport phenomena , 1999 .

[4]  M. Huggins.  Viscoelastic Properties of Polymers. , 1961 .

[5]  Nadine Aubry,et al.  Heat Transfer in a Drilling Fluid with Geothermal Applications , 2017 .

[6]  Helmut Ciezki,et al.  Status of Gel Propulsion in the Year 2010 with a Special View on the German Activities , 2010 .

[7]  C. Merkle,et al.  Numerical Modeling of Injection of Shear-Thinning Gel Propellants Through Plain-Orifice Atomizer , 2011 .

[8]  J. Antaki,et al.  Study of blood flow in several benchmark micro-channels using a two-fluid approach. , 2015, International journal of engineering science.

[9]  B. Natan,et al.  Flow of Gel Fuels in Tapered Injectors , 2000 .

[10]  Wei Zhang,et al.  Spray characteristics of gelled propellants in swirl injectors , 2012 .

[11]  D. Pochan,et al.  Injectable solid hydrogel: mechanism of shear-thinning and immediate recovery of injectable β-hairpin peptide hydrogels. , 2010, Soft matter.

[12]  R. Houwink.  Elasticity, plasticity and structure of matter , 1937 .

[13]  B. Natan,et al.  Numerical Solution of the Flowfield in an Aluminized Gel Fuel Ramjet , 2013 .

[14]  M. Massoudi.  Heat Transfer in Complex Fluids , 2011 .

[15]  M. Doi.  Explanation for the 3.4-power law for viscosity of polymeric liquids on the basis of the tube model , 1983 .

[16]  Helmut Ciezki,et al.  Overview of the German Gel Propulsion Technology Program , 2014 .

[17]  Mehrdad Massoudi,et al.  On the heat transfer and flow of a non-homogenous fluid , 2013, Appl. Math. Comput..

[18]  O. Campanella,et al.  Comparison of Monomethylhydrazine/ Hydroxypropylcellulose and Hydrocarbon/Silica Gels , 2010 .

[19]  O. Campanella,et al.  Modeling gelled fluid flow with thixotropy and rheological hysteresis effects , 2014 .

[20]  B. Natan,et al.  Experimental Investigation of a Ramjet Combustor Using an Aluminized Gel Fuel , 2013 .

[21]  M. Massoudi,et al.  Flow of granular materials modeled as a non-linear fluid , 2013 .

[22]  Albert Thumann,et al.  Gelled Green Propellant Rocket Motor and Gas Generator Technology at Bayern-Chemie - Status and Applications for Space Systems , 2014 .

[23]  I. Krieger,et al.  Rheology of monodisperse latices , 1972 .

[24]  O. Bég,et al.  PSEUDO-SPECTRAL AND VARIATIONAL ITERATION SIMULATION OF EXOTHERMICALLY-REACTING RIVLIN-ERICKSEN VISCOELASTIC FLOW AND HEAT TRANSFER IN A ROCKET PROPULSION DUCT , 2014 .

[25]  B. Natan,et al.  THE STATUS OF GEL PROPELLANTS IN YEAR 2000 , 2002 .

[26]  J. Buongiorno.  Convective Transport in Nanofluids , 2006 .

[27]  B. Natan,et al.  The injection process of gel fuels , 1997 .

[28]  W. Anderson,et al.  Droplet Burning of JP-8/Silica Gels , 2010 .

[29]  Jens von Kampen,et al.  Characteristic Flow and Spray Properties of Gelled Fuels with Regard to the Impinging Jet Injector Type , 2006 .

[30]  Estimation of the Rheological Properties of a Suspension in a Gel Fluid , 2013 .

[31]  B. Natan,et al.  Numerical Solution of the Flow of Power‐Law Gel Propellants in Converging Injectors , 2000 .

[32]  B. Natan,et al.  INVESTIGATION OF THE COMBUSTION PROCESS OF GEL PROPELLANTS , 1997 .

[33]  D. Mishra,et al.  Effects of gellant concentration on the burning and flame structure of organic gel propellant droplets , 2011 .