Linear heat transfer in a flow around a cylinder or a sphere

It is shown that the relation between the Nusselt and Reynolds numbers determined by the Reynolds analogy is linear with self-similarity of the hydrodynamic resistance coefficient.Special Design and Technology Office Element, Odessa, Ukraine. translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 68, No. 3, May–June, pp. 395–396, 1995.     

Analysis of the processes of heat transfer with periodic intensity with allowance for temperature fluctuations in the heat carrier

A previously developed method of analysis of the processes of heat transfer with periodic intensity is generalized to the case of simultaneous fluctuations of the temperatures of the wall and the liquid. A final expression for the dependence of the coefficient of conjugation on the generalized parameter of the problem is obtained. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 73, No. 2, pp. 250–254, March–April, 2000.     

Freely convective heat transfer at the external surface of a vertical isothermal cylinder

Numerical and experimental results on the freely convective heat transfer of a vertical isothermal cylinder are analyzed. Formulas are proposed for the calculation of local and average heat-transfer coefficients for Pr=0.01–100.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 33, No. 2, pp. 311–316, August, 1977.     

The critical heat transfer characteristics of an insulated or compound sphere considering heat radiation

Critical heat transfer from an insulated or compound sphere happen in ambient air with natural convection. Thus, heat radiation in such a situation must be considered because natural convection has only a small effect. It is found that the critical heat transfer characteristics considering heat radiation are very different from those neglecting heat radiation. The conventional critical heat transfer characteristics neglecting heat radiation only depend on sphere size, external convection heat transfer coefficient, and insulation conductivity. In addition to the above parameters, the critical heat transfer characteristics considering heat radiation are also related to the surface emissivities of the sphere and the insulation, the surrounding temperature, and the internal convection heat transfer coefficient.     

Nonsteady heat transfer from a cylinder with injection

The problem of nonsteady heat transfer from a cylinder in the presence of radial injection is analyzed. The heat flux at the surface of the cylinder is found from the assigned variation in the surface temperature by the method of [1].Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 34, No. 5, pp. 923–927, May, 1978.     

Schlieren investigation of the natural-convection heat transfer of a rotating sphere

The results of an experimental investigation are presented. A formula is obtained for estimating the effect of rotation. The schlieren method has been used to investigate the thermal boundary layer.     

A periodic problem of heat conduction in a hollow infinite cylinder

The problem of radial distribution of temperature in an infinite hollow cylinder is solved in the presence of heat exchange with the surrounding medium in the case in which the heat exchange coefficients are periodic functions of time.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 17, No. 5, pp. 880–891, November, 1969.     

The characteristic size of a sphere in convective heat transfer

The results of an experimental investigation of the convective heat transfer from a sphere to a temperature-stabilized gas flow for low values of the Reynolds number are presented. These results enable the following conclusion to be drawn: in the Nusselt number the radius of the sphere must be taken as the characteristic size and not the diameter, as is generally assumed.     

On the heat transfer from a permeable sphere in stokes flow

The heat transfer from a permeable sphere in a uniform, low Reynolds number flow is examined. In our analysis we consider the case when conduction is the dominant heat transfer mechanism in the exterior fluid, i.e. small Péclet number, and the case when convection is dominant, i.e. large Péclet number. Thermal boundary conditions at the surface of the permeable sphere are discussed. At small Péclet numbers the heat transfer rate from a permeable sphere is found to differ at leading-order from that found for an impermeable sphere, whereas, for large Péclet numbers permeability has only a weak or second-order effect on the heat transfer rate.     

Rheodynamics and mass transfer during periodic and nonuniform cylinder motion in polymer solutions

Rheodynamics and mass transfer features are studied using periodic and uniform cylinder motion in viscoelastic fluids of the dilute polymer solution type. Estimates are performed of the characteristic time of the solutions.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 54, No. 6, pp. 890–896, June, 1988.     

Unsteady heat transfer in transverse airflow past a cylinder

The airflow cooling of a thin-walled hollow copper cylinder is investigated in the range of Reynolds numbers Re=10⁴–10⁵.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 38, No. 5, pp. 813–819, May, 1980.     

Heat transfer from a transverse steamlined cylinder during surface boiling in a liquid fluidized bed

During bubble boiling from a horizontal cylinder, the heat transfer is investigated located in a bed of solid particles fluidized with water and underheated to the saturation temperature. Numerical empirical relations are given.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 36, No. 3, pp. 389–394, March, 1979.     

Self-oscillating process of heat exchange with periodic intensity

The limit of the stability of a heat carrier flow against small “density wave”-type perturbations is found. It is shown that stabilization of flow sets in on increase in the volume heat capacity and also in the amplitude of the heat-transfer coefficient fluctuations.     

The calculation of the thermal stresses in a cylinder and a sphere with variable surface temperature

The calculation of the thermal stresses at the surface and at the center of a cylinder and a sphere is suggested to be carried out with the use of the integral-mean temperature and the temperature of the center, computed through the multiplication of a piecewise-linear approximating surface temperature by specific coefficients.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 17, No. 5, pp. 944–950, November, 1969.     

Local heat transfer between a vertical cylinder and a fluidized bed

The heat-transfer coefficients for a vertical cylinder in a fluidized bed have been determined experimentally. The value of such a coefficient is found to vary considerably along the cylinder height.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol.21, No. 6, pp. 985–991, December, 1971.     

Mean heat transfer in transverse air flow around a cylinder

A modified method of analyzing experimental data is outlined, allowing the degree of linearity of the relation between the Reynolds and Nusselt numbers to be determined.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 59, No. 4, pp. 648–649, October, 1990.     

Forced-convection heat transfer over a circular cylinder with Newtonian heating

A mathematical model for the forced convection boundary-layer flow over a circular cylinder is considered when there is Newtonian heating on the surface of the cylinder through which the heat transfer is proportional to the local surface temperature. The dimensionless version of the boundary-layer equations involve two parameters, the Prandtl number σ and γ measuring the strength of the surface heating. The solution near the stagnation point is considered first and this reveals that, to get a physically acceptable solution, γ must be less than some critical value γ _c , dependent on σ. Numerical solutions to the full boundary-layer problem are obtained which show that the surface temperature increases as the flow develops from the stagnation point.     

Convective heat transfer in transverse gas flow over a cylinder

A method is described for studying convective heat transfer in transverse flow over a wire, from the temperature dependence of the heat transfer coefficients. A formula has been obtained for calculating convective heat transfer in gas flow over a. wire, for temperature differences up to 1000°C and Re values from 0.14 to 2.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 21, No. 1, pp. 78–83, July, 1971.