Heat transfer in a convergent channel with a permeable wall

The effect of a negative longitudinal pressure gradient and a transverse flow of material on the process of heat transfer in an axisymmetric channel is studied.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 32, No. 3, pp. 389–392, March, 1977.     

Heat transfer and hydraulic resistance in tubes with bladed swirls

Results from an experimental investigation of the heat transfer and hydraulic resistance in tubes with bladed swirls are examined; the swirls are unique in terms of the flow-twist angles which they produce and in terms of the radial variations in these angles.     

Heat transfer and hydraulic resistance in channels with spherical protrusions

This article presents an analytical overview of experimental studies of hydraulic resistance and heat transfer in channels with disturbed flow surfaces in the form of systems of spherical protrusions in a wide range of flow and design parameters. A uniform approach to generalization of experimental data by various authors has been developed considering differences in the geometry of heat-transfer surfaces. Uniform universal generalizing dependences have been obtained for the hydraulic resistance and heat transfer coefficients in channels with spherical protrusions.     

Heat transfer and hydraulic resistance in a short plane-parallel duct with artificially roughened walls

Experimental heat transfer and hydraulic resistance data are correlated by means of dimensionless relationships.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 17, No. 6, pp. 1098–1101, December, 1969.     

Heat transfer in a plasmotron channel

The dependence of the heat-transfer coefficient in a plasmotron channel on gas flow rate, pressure, and electrical power is studied.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 33, No. 1, pp. 50–53, July, 1977.     

Hydrodynamics and heat transfer in cooling systems with intersecting channels. II. Heat transfer and temperature fields

Results are provided of analysis and measurements of heat transfer and temperature fields at the numbers Re₁=1·10²-2·10⁴ and Pr=5.5–8, depending on the geometry and angles of streamline structure.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 61, No. 6, pp. 915–924, December, 1991.     

Heat transfer during laminar flow in a vertical annular channel with a constant temperature of the outer wall

Developed flows during combined convection in a vertical concentric annular channel are discussed. The problem is solved for descending and ascending flows. A dimensionless equation is obtained for calculating the value of the heat-transfer coefficient averaged over the length of the channel.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 33, No. 1, pp. 11–16, July, 1977.     

Heat transfer in a cylindrical underground channel

We treat the problem of the flow of a fluid in a cylindrical underground channel, taking account of the thermal interaction of the stream with the surrounding medium.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 27, No. 5, pp. 887–894, November, 1974.     

Heat transfer enhancement of backward-facing step flow in a channel by using baffle installation on the channel wall

Summary. Aiming to enhance the heat transfer characteristics of backward-facing step flow in a channel, the present study proposes a method to install a baffle onto the channel wall. The effects of the dimensionless baffle height H_b, baffle thickness W_b, and distance between the backward-facing step and baffle D on the flow structure, temperature distribution and Nusselt number variation for the system at various Re and Gr/Re² are numerically investigated. Comparing the results of the cases with or without the installation of baffle, the maximum augmentation on average Nusselt number is about 190% for the heating step and 150% for the heating section of the bottom plate when Pr=0.7, H_s=0.5, L=5, H_b=0.3, W_b=0.2, 100 Re 500 and 0Gr/Re²1. A slight movement of the baffle position could cause a drastic change in the transfer characteristics. In addition, as W_b varies from 0.2 to 0.5, the difference in the average Nusselt number is within 3%.     

Heat transfer in granular systems with a random structure

Heat transfer through a granular system with a random structure in the state of free filling is discussed. A model of random structure is proposed and a method for calculating the effective thermal conductivity of a granular system is presented.     

Heat transfer in power transformer windings with oil-forced cooling

Power transformer outages have a considerable economic impact on the operation of an electrical network. One of the most important parameters governing a transformer?s life expectancy is the hot-spot temperature (HST) value. The classical approach has been to consider the HST as the sum of the ambient temperature, the top-oil temperature rise and the hot-spot-to-top-oil temperature gradient. Temperature distribution is solved using the heat conduction equation. Finite element method is used in the numerical solution. The transformer selected for simulation is 32 MVA transformer with non-directed oil-forced cooling and directed oil-forced cooling. Comparing the results with those obtained from finite integral transform and experimental test checks the validity and accuracy of the proposed method.     

Heat exchange in jet cooling systems

Results are presented from an experimental study of heat exchange in a channel with jet delivery of a coolant. Criterional equations are proposed to calculate the effective temperature of the flow and local heat-transfer coefficients.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 45,No. 6,pp. 885–892,December, 1983.     

Heat transfer under radiation equilibrium in a rectangular channel

Local and integral resultant radiation fluxes on the wall of an infinite rectangular channel are determined numerically for the radiation equilibrium case. The error in the plane layer approximation is analyzed.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 40, No. 4, pp. 721–725, April, 1981.     

Heat exchange and hydraulic resistance in micronozzle grids

We give the results of an experimental investigation of heat exchange and hydraulic resistance when air flows through micronoazle grids.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 39, No. 5, pp. 798–801, November, 1980.     

Heat transfer in liquid motion through a rectangular channel

The results of an experimental study of heart transfer in water motion through slit channels are presented and compared with data obtained by other authors.Kiev Polytechnical Institute, Kiev. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 64, No. 5, pp. 515–522, May, 1993.     

Heat transfer in a dense moving layer in a cylindrical channel

Analytical results are presented on the heat transfer to the layer with rod-type direct motion of the components in a cylindrical pipe; the solutions are analyzed and a comparison is made with experiment.     

Heat and mass transfer in a slit gap with sublimation of a rotating disk wall

A solution is obtained for the problem of the temperature distribution in a narrow slit gap between a motionless heated disk and a moving disk with a subliming coating. It is established that rotation leads to intensification of the heat-transfer process.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 48, No. 4, pp. 587–592, April, 1985.