Heat Transfer Analysis in Double Pipe Heat Exchanger

<p>W/m.K (D)</p> Signup and view all the answers

<p>To monitor temperature changes at various points. (B)</p> Signup and view all the answers

<p>Double pipe heat exchanger (A)</p> Signup and view all the answers

<p>They are directly proportional. (A)</p> Signup and view all the answers

<p>Overall heat transfer coefficient (C)</p> Signup and view all the answers

<p>To investigate the effect of the Reynolds number on heat transfer (A)</p> Signup and view all the answers

<p>Valves 1-4 (C)</p> Signup and view all the answers

<p>Unsteady flow rate and conditions (A)</p> Signup and view all the answers

<p>Heat transfer coefficient increases with increasing Reynolds number (D)</p> Signup and view all the answers

<p>Pressure difference measurements (A)</p> Signup and view all the answers

<p>Heat loss due to lack of insulation (B)</p> Signup and view all the answers

<p>Counter-current flow was more efficient in run 1 and run 4 (C)</p> Signup and view all the answers

<p>Prandtl number and Reynolds number calculations (D)</p> Signup and view all the answers

<p>The exit temperature of one stream approaches that of the other. (B)</p> Signup and view all the answers

<p>It is directly proportional. (A)</p> Signup and view all the answers

<p>Fluctuations in the viscosity of the cold stream. (C)</p> Signup and view all the answers

<p>Nusselt number increases with an increase in Reynolds number. (D)</p> Signup and view all the answers

<p>The logarithmic temperature difference is higher. (A)</p> Signup and view all the answers

<p>Co-current flow values were higher than expected. (B)</p> Signup and view all the answers

<p>Viscosity values which change with temperature. (C)</p> Signup and view all the answers

<p>Counter-current Q values exceeded co-current Q values. (B)</p> Signup and view all the answers

<p>Its effect on the heat transfer coefficient. (D)</p> Signup and view all the answers

<p>By measuring time for a certain volume of fluid. (A)</p> Signup and view all the answers

<p>The difference between the outlet and inlet temperature of the same stream. (B)</p> Signup and view all the answers

<p>Because temperatures of streams converge as they flow in the same direction. (B)</p> Signup and view all the answers

<p>When temperature data from a thermocouple remains the same three times in a row. (A)</p> Signup and view all the answers

<p>The flow direction and flow rate based on pressure difference. (A)</p> Signup and view all the answers

<p>It is generally smaller than counter-current approaches. (C)</p> Signup and view all the answers

<p>Pressure differences in the cold stream. (D)</p> Signup and view all the answers

<p>$m = 1.223 \times (\Delta P)^{0.5}$ (B)</p> Signup and view all the answers

<p>$Re = \frac{\rho V D}{\mu}$ (C)</p> Signup and view all the answers

<p>$Pr = \frac{\mu C_p}{k}$ (D)</p> Signup and view all the answers

<p>$Nu = 0.023 Re^{0.5} Pr^{0.5}$ (A)</p> Signup and view all the answers

<p>$U + A = \frac{1}{r} ln(r_1/r_2)$ (B)</p> Signup and view all the answers

<p>$D_h = D_{outer} - D_{inner}$ (B)</p> Signup and view all the answers

<p>Temperature range of $0 \leq T \leq 100$ (C)</p> Signup and view all the answers

<p>W/m·K (D)</p> Signup and view all the answers

<p>𝑄 = 𝑈𝐴(∆𝑇#$) (C)</p> Signup and view all the answers

<p>Volume divided by time (C)</p> Signup and view all the answers

<p>0.7319 kg/m³ (B)</p> Signup and view all the answers

<p>Overall heat transfer coefficient (B)</p> Signup and view all the answers

<p>𝑄 = 𝑚𝐶𝑉(∆𝑇) (B)</p> Signup and view all the answers

<p>To relate momentum diffusivity to thermal diffusivity (C)</p> Signup and view all the answers

<p>$mass = volume \cdot 𝜌$ (D)</p> Signup and view all the answers

The rate at which heat is being transferred in a heat exchanger. It is typically measured in Watts (W).

A measure of how easily heat is transferred through a material. It is typically measured in Watts per meter Kelvin (W/m.K).

A dimensionless number that represents the ratio of inertial forces to viscous forces. In this context, it indicates the level of turbulence in a fluid.

A dimensionless number that represents the ratio of momentum diffusivity to thermal diffusivity. It indicates the relative importance of heat transfer by convection and conduction.

A measure of a substance's resistance to flow. It is typically measured in Newton-seconds per square meter (Ns/m^2).

A dimensionless number that describes the ratio of heat transfer by convection to heat transfer by conduction. It represents the effectiveness of heat transfer due to fluid motion.

The difference in temperature between two fluids in a heat exchanger, considering the logarithmic mean. It is typically measured in Kelvin (K).

This experiment investigated the heat transfer dynamics in double-pipe heat exchangers, analyzing how co-current and counter-current flow patterns affect heat transfer coefficients. It also explored the impact of Reynolds number on heat transfer.

The difference between the outlet and inlet temperatures of the same fluid stream in a heat exchanger.

The difference between the inlet temperature of the hot stream and the outlet temperature of the cold stream in a heat exchanger.

A flow pattern in a double-pipe heat exchanger where both the hot and cold streams flow in the same direction.

A flow pattern in a double-pipe heat exchanger where the hot and cold streams flow in opposite directions.

A measure of the rate at which heat is transferred between fluids in a heat exchanger.

A dimensionless number that describes the ratio of inertial forces to viscous forces in a fluid flow.

A measure of how effectively heat is transferred from a surface to a fluid.

A type of heat exchanger consisting of two concentric pipes where the hot and cold streams flow in either co-current or counter-current directions.

The difference between the temperature of the hot fluid and the cold fluid at a given point along the heat exchanger.

The relationship between heat transfer and the rate at which heat is transferred from a surface to a fluid.

The difference in temperature between the hot fluid at the inlet and the cold fluid at the outlet of a heat exchanger.

The amount of heat transferred from one fluid to another in a heat exchanger.

The ratio of inertial forces to viscous forces in a fluid. It indicates the level of turbulence and helps determine the heat transfer regime.

A dimensionless number representing the ratio of momentum diffusivity to thermal diffusivity. It shows the balance between heat transfer by convection and conduction.

The total amount of heat transferred in a heat exchanger, calculated using the mass flow rates, specific heat capacities, and temperature differences between the hot and cold streams.

The difference in temperature between the hot and cold streams in a heat exchanger, considering the logarithmic mean of the inlet and outlet temperatures.

The coefficient that describes the effectiveness of heat transfer due to fluid motion. It represents the ratio of heat transfer by convection to conduction.

The primary reason for differences in experimental results. Lack of insulation leads to heat loss, affecting the accuracy of measurements.

Tells you the ratio of inertial forces to viscous forces in a fluid flow. Higher number means more turbulence.

A measure of how effectively surface heat is transferred to a fluid. This tells you how well the heat exchanger is performing.

A type of heat exchanger where two fluids flow in concentric pipes, either in the same or opposite directions. Co-current flows in the same direction. Counter-current flows in opposite directions.

The difference between the hot stream inlet temperature and the cold stream outlet temperature in a heat exchanger.

The difference between the outlet and inlet temperatures of the same fluid stream in a heat exchanger.

A measure of the rate at which a fluid flows, usually measured in ml/s.

The mass flow rate of a fluid is proportional to the square root of the pressure difference. It's typically measured in kilograms per second (kg/s).

The heat transfer coefficient is a measure of how effectively heat can be transferred between a surface and a fluid. Measured in Watts per square meter Kelvin (W/m²K).

The overall heat transfer coefficient is used to calculate the total heat transfer rate across a composite wall or through a heat exchanger. It's the inverse of the sum of resistances to heat transfer.

The hydraulic diameter is used to approximate the diameter of a non-circular flow channel, such as an annular space. It's used for calculations involving fluid flow and heat transfer in such geometries.

Analogy used to calculate the overall heat transfer coefficient in a composite wall or heat exchanger. Each resistance to heat transfer is treated as a series circuit element.